38 of 1932 - Adopting a Standard Code for Installation of Gravity Warm Air Heating Systems. ROLL CALL
VOTING r AYE NAY Salt Lake C;ty Utah NOV 171932 - 193
Finch
I move that the etr he adopted
Keyser _f
Knight t/ Y
Lake
Mr Chairman
. F—IgnILIT LW—
Result
AN ORDINANCE ADOPTING the Standard Code for the installa-
tion of gravity warm air heating systems in buildings used for human
habitation and providing penalties for the violation of the previsions
of said Code.
Be it ordained by the Board of Commissioners of Salt Lake
City, Utah
Section I. That the eighth edition of the Standard Code
Regulating the Installation of Gravity Warm fir Heating Systems in
buildings used for human habitation adopted, approved and issued
by the National Warm Air Heating Association, Inc , the American
Society of Heating & Ventilating Engineers and the National Asso-
ciation of Sheet Metal Contractors is hereby adopted by Salt Lake City
as the ordinances, rules and regulations pertaining to and regulating
the installation of warm air heating systems in all buildings used
. . for human habitation in said city, provided that Article 3 of said
Code is hereby amended by adding to said Article a new Section to
10
be known as Section 3A, which shall read as follows
3A In determining the B t. u loss of any structure com-
ing under this code by the use of the constants and rules set
out in this article (Article 3) it is definitely recognized that
these apply to the ordinary building when the aforesaid rules
and constants are applied to the individual room and the total
heat loss for the structure being the summation of the heat loss
developed by each individual room Where a structure differs
from the ordinary residence, that is where the exposure is great-
er than that of the ordinary residence or where more. than two air
changes per hour are required the foregoing rules shall not be
used, but the total heat loss in B.t u is per hour shall be de-
termined by the standard method using coefficients of heat trans-
38
-3-
I
ney shall be such so that when a furnace is installed the
height of said chimney will be not less than 3lfeet above the
grate of said furnace
SECTION 2. All gravity Warm Air Heating Systems installed
, in buildings used for human habitation in bait Lake City and all
installation and construction work incidental thereto shall strictly
(comply with and conform to the provisions of the Standard Warm Air
Heating Code and amendments adopted in Section I of this ordinance
SECTION 3 This Code may be cited and designated as the
Standard Warm Air Heating Code.
SECTION 4 Any person violating any' provisions of this
ordinance or any of the provisions of the Standard Warm Air Heating
Code shall, upon conviction thereof, be punished by a fine in any
sum not exceeding One Hundred Dollars (0100 00), or by imprisonments!
in the City Jail for a period not exc,ed3,ng thirty (30) days, or by'
both such fine and imprisonment The court may, in imposing a fine,
enter as part of the 3udgment that, in default of payment of the
fine, the defendant may be imprisoned in the City Jail for a period
,not exceeding six months.
SECTION 5 In the opinion of the Board of Commissioners,
it is necessary to the peace, health and safety of the inhabitants
of Salt Lake City that this ordinance take effect immediately.
SECTION 6 This ordinance shall take effect upon its first
publication. )� j
Passed y the Board of Co issioner of Salt Lake City,
Jtah, on the f 7' day of 1932
; A
ze11 Q� _. emporary Chas at
ity Recorder.
1
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-2-
fer Should it be desired to construct a building whose wall
construction does not come under one of the classifications
set out in this Code the City Engineer shall determine or shall
be assured to his entire satisfaction as to the coefficient o
heat transfer for such material or such combination of mater-
ials and such coefficient of heat loss shall be used in deter-
mining the total B.t u 's to be provided for by the furnace
I And Article 3 is further amended by adding to said Article a new
Section to be known as Section 10, which shall read as follows,
to-wit:
SEC 10 All warm air heating furnaces installed within
i
the corporate limits of the City of Salt Lake and coming with+
in this Code shall be rated in terms of B t u output by the
City Engineer or his authorized representative when said fur-
naces are used to burn fuels ordinarily available in the City,
of Salt Lake, the term "fuel" being defined for purposes of
this code as bituminous coal, coke, fuel oil or gas In the
event that the City Engineer has not been satisfied as to the
rating of any warm air heating furnace offered for installa-
tion within the corporate limits of the City of Salt Lake or
combination of such furnace and stoker, in B.t u.'s at the
bonnet, then in that event he shall rate said furnace accord
ing to formula and rule set out in Section 9 of the Standard
Code Regulating the Installation of Gravity Warm Air Heating
Systems for Residences
And said Code is further amended by eliminating entirely therefromil
Article 5 and in lieu thereof Article 5 shall read as follows
Article 5 Any structure coming within this Code shall
be provided with a chimney which shall be constructed in con-
formance with "A Standard Ordinance for Chimney Construction"I
recommended by the National Board of Fire Underwriters third
edition revised 1927 The minimum net dimension of such chim-
ney shall not be less than 12 inches nor shall the cross sec-
tional area be less in square inches than the total B.t u loss
of the structure divided by 1900 The minimum height of chiml
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The
Standard Code
REGULATING THE INSTALLATION
OF GRAVITY WARM AIR
HEATING SYSTEMS
IN RESIDENCES
- - EIGHTH EDITION -
HEAT 9�
CLEAN AIR
THIS SYMBOL IS THE IDENTIFYING
MARK OF THE DEALER WHO IS PLEDG-
ED TO INSTALL WARM AIR
SYSTEMS ACCORDING TO THEEATING SPECI-
FICATIONS OF THIS STANDARD CODE.
Printed in U.S.A.
EIGHTH EDITION
Aug.1,1931
Standard Code
Regulating the
Installation of Gravity
Warm Air
Heating Systems
In Residences
This Code Is approved and tutted by
authority of the:
National Warm Air Heating
Association, Inc.
Office of Managing Director 3440 A.I.U.Bldg.
Columbus, Ohio
The American Society of Heating and
Ventilating Engineers
Office of Secretary. 51 Madison Ave.
New York, N. Y.
National Association Sheet Metal
Contractors
Office of Secretary, 429 Fourth Ave.
Pittsburgh, Pa.
Additional copies Al a Cade
S may be secured from any
of
Quantity ord..s can be secured from
McMullen Printing Co.
4000 Laclede Ave. St.Louis,Mo.
/xi
What The Standard Code Is
The Standard Code is,as the full name implies,
a set of rules to govern the proper installation of
Warm Air Heating Systems in Residences.
A Warm Air Heating System consists essential-
ly of a furnace,with casing and smoke pipe, to-
gether with a properly designed system of heat-
ing pipes and outlets,known as registers;also air
ducts to convey the unheated air to the furnace.
The average home owner does not realize that
the proper design and correct installation of heat-
ing pipes is an essential part of the heating
system. No matter how well the furnace is
made it cannot give its full service unless it is
properly installed.
For over twenty-five years,the Manufacturers
of warm air furnaces, Engineers, and Installers
have made numerous efforts to establish a
practical set of rules that would govern the instal-
lation of Warm Air Heating Systems. This was
done to protect the public against wrong instal-
lations. As nearly three out of every four homes
in which a central heating system is installed,
use this most flexible system,some protection
to the home owner is needed.
The enclosed rules have been established after
many meetings and a complete study of the
situation in all parts of the United States,
together with years of research work at the
' University of Illinois.
The authority back of this code is shown on
the preceding page.
The National Warm Air Heating Association,
Inc.represents approximately 90% of the out-
put of warm air furnaces.
(3)
1,
The American Society of Heating and Ventilat-
ing Engineers represents over 2000 Heating and
Ventilating Engineers.
The National Association of Sheet Metal
Contractors represents over 7000 Sheet Metal
Contractors and Furnace Installers.
This Code now makes it possible for the home
owner to check over his own heating plant and to
observe whether the installation of the heating
plant has been made correctly and in a safe
manner.
Every person who intends to install a warm
air heating system in either a new or old house
owes it to himself to specify that it shall be
"Installed According to the Standard Code."
Only those installers who have pledged them-
selves to install warm air heating systems ac-
cording to this Standard Code are entitled to
use the symbol shown on the front cover of this
booklet. It is your protection and you can be
sure of receiving a"code"installation by dealing
with a dealer or manufacturer who displays this
symbol. Such an installation is triply endorsed
by the Installer,the Furnace Manufacturer and
the National Warm Air Heating Association.
EIGHTH EDITION
Standard Code Regulating the Installation
of Gravity Warm Air Heating Systems
in Residences
The Eighth Edition of the Standard Code
supersedes all previous issues and contains
corrections to date.
1st Edition issued Oct. I, 1922
2nd Edition issued Feb. I, 1923
3rd Edition issued June I, 1924
4th Edition issued May I, 1927
5th Edition issued Mar. I, 1928
6th Edition issued Mar. I, 1929
7th Edition issued Sept. I,1930
8th Edition issued Aug. I, 1931
(4)
ARTICLE No. 1
Meaning of the Term "Gravity Warm Air
Furnace Heating System"
Gravity Warm Air Heating Systems, to which
this code refers, shall consist of one or more
warm air furnaces, enclosed within casings, to-
gether with necessary appurtenances thereto,
consisting of warm air pipes and fittings, cold
air or recirculating pipes, ducts, boxes and fit-
tings,smoke pipes and fittings,registers,borders,
faces and grilles, the same being intended
for heating buildings in which they may be
installed.
ARTICLE No. 2
Certified Measurements
Certified measurements on warm air furnaces
together with the name and number of that
furnace,will be issued by authority of the Nat-
ional Warm Air Heating Association, when, if
and as,the grate areas and heating surfaces have
been accurately measured and approved by the
Research Advisory Committee.
(s)
3
ARTICLE No.3
Method for Determining Sizes of Warm Air
Pipes, Wall Stacks and Furnaces for
Use in Residences
Method for Determining Sizes of Basement Warm
Air Pipes
Section 1. Each First Floor Room.
Divide square feet of exposed glass by 12,
Divide square feet of net exposed wall,ceiling
or floor by factors in Table A.
Divide cubic contents by 800,(Note 6)
Add together the above and multiply by 9.
The result is the area of the basement pipe in
square inches.
Stated as an equation,this is,
The sum of:
Glass(eq.ft.)(NoteI)+11 l
Net Watl(sq.ft.)(Noteto 2)+( .' (,A).x9=Area of
Cu.Content.(Note6)+800 Baem't. Pipe
Section 2. Each Second Floor Room
Divide square feet of exposed glass by 12,
Divide square feet of net exposed wall,ceiling
or floor by factors in Table A.
Divide cubic contents by 800, (Note 6)
Add together the above and multiply by 6.
The result is the area of the basement pipe in
square inches. (See Art.3 Sec.9, (c).
Staled as an equation,this is,
The sum of:
Glass (eq.ft.)(Note I)+12 es o
Net Wall(eq.ft.)(Note 2)+ Table n) x6.Area of
Cu.Contenm(Note6)+800 Baem't.Pipe
Section 3. Each Third Floor Room
Divide square feet of exposed glass by 12,
Divide square teet of net exposed wall,ceiling
or floor by factors in Table A.
Divide cubic contents by 800, (Note 6)
Add together the above and multiply by 5.
The result is the area of the basement pipe in
square inches.
Staled as an equation,MI,is,
1 ,
The Sum of:
Glass(eq.ft.)(Note 1)+12 l
Net Wall(eq.ft.)(Note 2)+(T.bie"Z)J x5.Area of
Cu.Content.(Note 6)+800 Basm't.Pipe JJJ
(6:
Basis of Working Rules for Pipes
(Section 1-2-3)
(a)These formulae are for 70 degrees temperature
difference(outside temperature zero,inside temp-
erature 70 degrees Fahrenheit). When temperature
difference is more than 70 degrees,add I M%per
degree above 70°to final figures. When temper-
ature difference is less than 70 degrees, deduct
I%%per degree below 70°from final figures.
(b) The values as given in Table A for use in the
working rules. Article 3,Sections I -2 and 3 are
derived as follows:
EXAMPLE:
The unit of calculation adopted for this is the equiva-
lent of 1000 b.t.u. transmitted. Any other number
than 1000 might be selected if desired and the result
would be the same. Calculations are based on the
commonly accepted data for heat loss through different
types of walls. Thus,the factor 60,Item No.I,Table
A,is obtained in the following manner:The rate of heat
transmission through a wall consisting of siding,paper.
sheathing,studding,lath and plaster, is 0.238 b.t.u.
per square foot,per hour,per degree difference between
room and outside temperatures. At 70 degrees inside
and zero outside,one square foot of wall will transmit
0.238 x 70=16.66 b.t.u. per hour. 1000 b.t.u.will
then be lost through 1000+I6.66=60 square feet of
wall. Since it is found from experiment that one square
inch of first floor leader pipe delivers III b.t.u.,it
will require 1000*I11=9 square inches to compen-
sate for the loss through 60 square feet of wall. From
this we derive the formula:
60 a 9 =Area of first floor leader
Substituting 167 for the second floor and 200 for the
third floor in place of III, gives the factors 6 and 5
respectively.
Other values in Table A for the different types of walls
were obtained by substitution of proper coefficient of
heat transmission instead of 0.238 in the above formula.
Co-efficients used in Table A taken from A.S.H.&
V.E. Guide 1929.
TABLE A
(The factor 60 used in the above example,is for
buildings constructed as in item No.I (a). When
other types of walls are used substitute the appro-
priate factor as given below).
Exposed Wall
FACTORS
No. I-(a) Frame Wall constructed of siding,paper,
sheathing,studding,lath and plaster 60
(b) Same(I-a)construction substituting
fibrous board or equivalent for the lath. 80
• (c) Same(I-a)construction with additional..
33)"insulating fill between studding 140
For stucco on frame walls, use the same
values as for frame with siding,as shown in
1-(a),I-(b)and I-(c).
No. 2- 9"Brick wall plastered on one side 40
No. 3-(a) 9"Brick wall,air space,furred and plus-.
tered 57
(b) Same(3-a)construction substituting%"
fibrous board or equivalent for the lath 84
No. 4- 13"Brick wall,plastered on one side 52
No. 5-(a) 13"Brick wall,air space,furred and
plastered 69
(7)
)
3
(b) S e(5-a)construction substituting 3"
fibrous board or equivalent for the lath 97
No. 6- 4"brick,4"or 8"hollow tile plastered 57
No.7—(a) 4" brick, paper, sheathing, studding,
lath and plaster.(brick veneer) 58
(b) Same(7- )construction substituting%"
fibrous board or equivalent for the lath 84
(c) Same(7-a)construction with additional
3 y"insulating fill between studding 158
No.8— Stucco on 8"Hollow tile.and plaster 48
No.9—(a) Stucco on 8" Hollow tile, furred and
plastered 65
(b) Same(9-a)construction substituting%"
fibrous board or equivalent for the lath 95
CEILINGS
WITH ATTIC SPACE ABOVE
No.I0-(a) Lath and plaster without floor above 50
(b) Same (10-a) construction substituting
%" fibrous board or equivalent for
the lath 70
(c) Same(10-a)construction with additional
3."fibrous board or equivalent nailed
on top of joists 90
(d)Same(10-a)construction with additional
3Y"insulating fill between joists 150
No.I I-(a) Lath and plaster with tight floor above 90
(b) Same (I I-a) construction substituting
t,"fibrous board or equivalent for the
lath 104
(c) Same(I 1- )construction with additional
3 M"insulating fill between joists 183
No.I2-(a) Metal without floor above 40
(b) Same(I2-a)construction with additional
34"fibrous board or equivalent between
metal and joists 65
(c) Same(I2-a)construction with additional
%" fibrous board fastened on top of
joists 85
(d) Same(I 2-a)construction with additional
3)z"insulating fill between joists 145
No.13-(a) Metal with tight floor above 75
(b) Same(13-a)construction with additional
H."fibrous board between metal and
joists 95
(c) Same(13-a)construction with additional
334"insulating fill 176
CEILINGS
WITHOUT ATTIC SPACE ABOVE—PART
OF THE ROOF
No.I4-(a) Lath,plaster,rafter,sheathing,any type
of shingles or roofing 57
(b) Same (I4-a) construction substituting
34"fibrous board or equivalent for
the lath 74
(c) Same(14-a)construction with additional
3%"insulating fill 130
FLOORS
OVER EXPOSED OR UNHEATED SPACES
No.15-(a) Double floor,on joist, 42
(b) Same(15-a)construction with additional
%"fibrous board fastened to bottom
of joists 88
(c) Same(15-a)construction with sheathing
fastened to bottom of joists and with
additional 33/"insulating fill between
joists 140
The substitution of 34"insulating materials
for sheathing should not be considered
as having any additional insulating value.
!s)
21
Explanatory Notes
Note I. In obtaining glass surface use full Be-
ment opening. An outside door is figured as glass.
Note 2. To obtain net outside wall multiply height
by width and deduct all windows and outside doors,
as obtained in Note I. For all rooms with attic
spaces immediately above,full ceiling areas shall be
taken into account, using table A. Floors over
unheated spaces shall be taken into account, using
Table A. For walls and doors between heated and
unheated spaces—use 50%of similar outside ex-
posure.
Note 3. For rooms having unusual exposure,
(ordinarily north,northeast and northwest,)add 15%
to the calculated pipe area.
Note 4. Use no basement warm air pipe less than
8 inches in diameter. If a basement warm air pipe
figures not to exceed 10% greater area than any
standard commercial size th n the nearest commercial
size shall be used, provided however, that the total
leader pipe area for each floor shall in no ase be
less than the total calculated requirements according to
Sec.I.2 and3.
Note 5. It is understood in using the above values
for determining basement warm air pipe areas,that
these pipes should be run comparatively straight and
that they should not be over 12 feet in length.Sharp
turns and long pipes should have extra capacity.
When warm air pipes exceed 12 ft. in length or
have more than two 90 degree turns,the next larger
commercial size pipe must be used.
Note 6. The value of 800(used in cubic contents)
is for an estimated air change of one room volume
per hour. To provide for 1 t/a room volume use the
figure 600. For 2 room volumes use the figure 400.
Size of Wall Stacks
Section 4. First Floor Rooms.
Same as Section I.All first floor fittings and
• connections,shall maintain a free area equal
to the round basement pipes leading to them.
Section 5. Second Floor Rooms.
Not less than 70%of calculated basement
pipe area as determined in Section 2.
Section 6. Third Floor Rooms.
Not less than 70%of calculated basement
pipe area as determined in Section 3.
Section 7.(a)Where two or more rooms are heated
from the same basement pipe and stack,
the area of such basement pipe and stack
shall equal the combined areas as de-
termined in Article 3,Sections I,2,and 3.
(b) Transition from warm air pipes to
stacks or register heads shall be made with
a well designed elbow or boot.
Size of Registers
Section 8. All registers shall have a free area
at least equal to the area of the basement
pipes leading to them, and shall be of the
approximate width of the stacks or fittings
to which they are attached.
(9)
Size of Furnace.
Section 9. (a) Add together the leader pipe
areas(expressed in square inches)necessary
for heating the building, as determined by
the foregoing calculated requirements,Art.
3,Sec. I,2 and 3. and install a furnace.
rated by the following formula:
Furnace Rating Formula
L= 1.75 G [I + 0.02 (R—20)]
L =square inches of warm air pipe connected
to the furnace as calculated.
G=grate area in square inches;the area of the
fire pot at the grate level,its most restricted
area.
R=ratio of heating surface area to grate area;
1.75 =a constant based upon the results ob-
tained in the Association Research on a
furnace having 20 square feet of heating
surface for each square foot of grate.
The above equation is based on the:—
efficiency of heater 0.55;combustion rate of
7.5 pounds of coal per sq. ft. of grate per
hour; calorific value of fuel 12,790 B.t.u.
per lb.;percentage of heat available at regist-
er 0.75; average B.t.u.delivering value of
one sq. inch of leader pipe area, assuming
half of the heat is sent to each floor, 136;
and on an operating temperature of 175
deg.F.at the register.
The formula allows 1.75 square inches of
warm air pipe area for each square inch of
grate area, for the furnace having a ratio of
heating surface to grate surface of 20 to I. For
furnaces having other ratios of heating surfaces
to grate surface, it adds 2 per cent or deducts
2 per cent for each unit above or below a ratio
of 20.
Application:-
No.I No.2 No.3
Positive No Negative
Correction Correction Correction
Grate area.eq.in. = 346 346 346
Heating surface area
Lt in. = 7540 6920 5665
Ratio heating surf ace
area to grate area = 21.8 to I 20.0 to 1 16.4 to I
R—20 = 1.8 0.0 —3.6
Correction per cent= 3.6 0.0 —7.2
1.75 G = 606 606 606
L= 1.75 G+cor-
rection = 628 606 562
(b) Every warm air furnace shall be equipped
with a water pan or other humidifying device.
not
Second Floor Heating
(c)In second floor duplex, flats or apartments
where separate heating plants are used, add
50%to the total net calculated areas as determined
in Art.3,Sec. 2. This represents the required
furnace capacity in square inches of leader pipe
area. Leaders and stacks are not to be increased.
Gas or Oil-Fired Furnace
(d) In the application of any gas or oil-fired
furnace to any warm air heating system,
any deviation from the Standard Code shall
apply only to the furnace itself.
Limitations of the Code
(e) The formulas for determining the size of
basement warm air pipes are applicable to rooms
of the proportions found in the average residence.
For rooms having ratios of glass to cubic con-
tents falling outside of these average proport-
ions, adjustment must be made in the number
of air changes to be used.The formulas are not
applicable to pipes having diameters greater than
14 inches or lengths greater than 12 to 16 feet.
The rating formula is applicable to furnaces
of the common type of construction having
round firepots and ratios of heating surfaces to
grate area between 15 and 30. The formula is
not applicable to furnaces of special conttruct-
ion, or equipped with unusual special features,
to ratios outside of 15 to 30, nor to coals de-
viating materially from 12000 B.t.u.per pound.
ARTICLE NO.4.
Installation
Location of Furnace
Section 1. The location of the furnace shall
equalize the length of warm air pipes as far
as possible, yet give necessary preference
to pipes supplying rooms having unusual
requirements.
Foundation
Section 2 (a) Furnace foundation of brick,
cement,or other like incombustible material
must be provided. Said foundation shall
extend at least fifteen inches (15") at rear
and sides of furnace casing and at least
thirty-six inches (36") in front of furnace
casing. Foundation to be level. (See Art.5).
(b) Where it is necessary to place a furnace
on a combustible floor, not less than four
inches (4") of hollow tile shall be used in
every instance, having joints matched in
such a way that air passage will be free
from side to side,so that at no time will the
p4
•
irs
�r1 '
E+ !
3
removal of ashes or the handling of coal
close up these openings. Such foundation
shall be constructed upon,and covered with
continuous sheet metal plates, of not less
than No. 24 gauge metal,having all joints
substantially riveted or double seamed and
the bottom sheet to have the edges turned
up at least one inch. This floor covering shall
extend under the whole of the fire box and
ash pit of the furnace and outwardly not
less than 12 inches on all sides and rear of
casing or base ring and 36 inches in front.
Setting or Assembling of Furnace
Section 3. (a) The base ring of any portable
warm air furnace shall be cemented to the
foundation, and cement flushed in around
the back of the base ring, making an air-
tight joint. The furnace parts shall be
assembled plumb and level and in a work-
manlike manner.
(b) All sections and joints shall be proper-
ly fitted. Joints requiring cement shall be
well filled and all bolts shall be drawn up
tightly.
Casings
Section 4. (a) Warm Air furnaces shall be en-
closed in metal casings or walls of brick,
tile or concrete.
(b) Portable. Sheet metal casings including
casing tops or bonnets shall be made of gal-
vanized sheets, not lighter than 26-U. S.
Standard Gauge. They shall fit the castings
and casing rings closely, so as to be dust
tight,and shall be securely fastened to the
front. The casing shall be lined from the
upper casing ring down to a line on a level
with the grate.
(c) When side collars are used the casing
top or bonnet must be of sufficient height so
that the largest warm air pipe can be taken
from side without ovaling. In no case shall a
distance less than eight inches(8")be main-
tained between the top of any furnace and
the bonnet.
(d) Any furnace, the casing top of which
shall come within twelve inches (12") of a
combustible floor, ceiling or joist, shall be
protected by a metal shield, extending not
less than eighteen inches (18") beyond the
casing of said furnace. This shield shall be
suspended at least two inches below wood
work,allowing free air space between shield
and woodwork. No furnace casing or top,
(12)
coming nearer than six inches(6")of ceiling
or joists shall be allowed in any case. All
metal casing tops shall be insulated with an
air space or covered with magnesia,asbestos
boiler covering or sand.
(e) Openings for side casing collars shall be
cut into the casing top or bonnet,so that the
tops of all openings are on a level. Casing
collars shall be fitted into place with a
proper flange, or bead on the outside and
drawn up on the inside, making a dust-
tight joint. All collars shall be of same
size as the warm air pipes to which they
are to be connected.
(f) Brick, cement or hollow tile casings
shall be constructed as follows: Walls shall
be not less than eight inches(8") in thick-
ness, and shall be constructed air tight.
The least inside dimension of rectangular
casings shall be the same as that of the
portable casing of a corresponding size of
furnace. Walls shall be carried to the same
height as the portable walls, allowing not
less than eight inches(8")between the top
of the furnace and the bottom of the top
cover. After placing the collars for the
warm air pipes, continue the masonry up
2" above the top of the collars, lay angle
or tee irons across the furnace top, spaced
8",cover these with sheet metal not less than
26 U. S. S. gauge,cover the sheet metal
with masonry or sand and run the side
walls four inches (4") above the roof of
the furnace.A galvanized iron casing bonnet
may be used on a brick set furnace.
Provision shall be made in the walls for
a manhole to give ingress to heater.
Warm Air Pipes in Basement
Section 5. (a) All warm air pipes shall be made
of bright tin not lighter than IC,or galvan-
ized iron. Side seams shall be locked seams.
All joints shall be either double seamed or
lapped not less than one and one-quarter
inches(I)"). Such joints shall be match-
beaded,or beaded and soldered,or riveted.
All pipes and fittings shall be properly
secured to ceiling or joist. No solder or
riveted joint is required where round
pipe slips over the casing collar or enters
boot or box. Any pipe twelve inches (12")
or greater in diameter shall not be made of
material lighter than IX tin or No. 26
U.S.Standard Gauge galvanized iron.
(b) All warm air pipes in the basement
(13)
tl
`.d
shall have an upward pitch of not less than
one inch(I")per running foot.
(c) No warm air pipe shall run within one
inch (I") of any woodwork unless such
woodwork is covered with asbestos paper
and the paper covered with tin or iron.
(d) All warm air pipes in the basement
shall be provided with dampers supported
on both sides not more than two feet from
the casing.
(e) Where warm air pipes pass through a
masonry wall, a metal thimble shall be
provided, having a diameter at least I"
greater than the pipe, and pipe supported
in such a manner that the air space is
uniform on all sides.
(f) Where warm air pipes pass through or
into unheated spaces separated from the
furnace room they shall be insulated with
not less than three layers of air cell as-
bestos paper or the equivalent.
Wall Stacks
Section 6. (a) Single Stacks. All single wall
stacks or wall pipes,heads,boots,ells,tees,
angles and other connections shall be made
of tin or galvanized iron and shall be
covered with not less than one thickness
of 12 lbs.per one hundred(100)square feet
of asbestos paper. All such stacks shall be
braced in a proper manner so as not to
obstruct the flow of air but to retain the
full capacity throughout. All joints shall
be locked and held in place by means
of lugs,or straps. No joint,either horizontal
or vertical,shall depend wholly upon solder
to make it tight. An air space of not less
than five-sixteenths(5/16)of an inch shall
be allowed on the two sides nearest the verti-
cal studs. See also(d).
(b) Double Stacks. All double wall stacks
or wall pipes,heads,boots,ells,tees,angles
and other connections shall be made of
tin, not lighter than IC or galvanized
iron and shall be made double, from and
including the boot or foot piece in basement
to the top of each and every stack and
register head on all floors. There shall be
uniform air space of not less than five-
sixteenths (i"s) of an inch, which must be
maintained between the outer and inner
walls of all such pipes and fittings of all
kinds, styles and descriptions;such pipes,
heads, boots and other fittings to be of the
styles, or equal to those accepted by the
National Board of Fire Underwriters.
un
(c)All stacks and fittings either single or dou-
ble must be secured firmly in place by lugs or
straps attached to the outer walls of stacks
and fittings, and no nails shall be driven
through these stacks or fittings at any point.
No lugs or straps shall be formed by cut-
ting holes in outer walls of stacks or fittings.
No wall pipes or fittings shall be used which
depend wholly on soldered joints. The
various members shall be so made that all
joints are locked or soldered and the
several members shall be attached to each
other with slip joints, which are, for the
purpose intended,air tight.
(d) Where stacks, heads, boots or other
fittings, whether double or single, go
through the first floor, all openings around
such heads, boots, stacks or fittings must
be filled with asbestos cement or other in-
combustible insulating material to make
the openings gas and dust tight. In no case
shall any metal surface of stacks,heads,boots
or other fittings conveying heated air come in
contact with any wood girder,joists or floor-
ing of the first floor.
Registers
Section 7. (a) When baseboard or wall registers
are used, they shall be properly sealed
to the stack head in such a manner as to
prevent any leakage of air between the head
and the register.
(b) Floor registers shall be provided with
double register boxes of tin or galvanized
iron with an air space of not less than five-
sixteenths (ss) of an inch between inner
and outer boxes;or,where single boxes are
used,they shall be insulated from the wood
or other combustible material by asbestos
paper covered with sheet metal,or by the
use of register borders.
(c) Registers for warm air, and warm air
pipes,stacks and fittings shall not be located
in outside walls, unless properly insulated
with 1" air cell covering or its equivalent.
(d) Any furnace system having not more
than two warm air openings,at least one of
these openings shall be without valve or
louvers and the pipe thereto shall be with-
out damper.
Air Supply to Furnace
Section 8. (a) The air supply to the furnace
may be taken from outside or from within
the building or may be taken partially from
outside and partially from within. In no
(is)
)
case, however,shall air be supplied to any
furnace from any basement or furnace
room, not occupied as living quarters.
(b) The cold air intake or return where
air is taken from within the building shall
have a net area throughout its entire length
of not less than the combined net area of
all warm air pipes leading from the furnace.
This may be maintained in one or more
ducts. No reverse incline or air trap will be
allowed in any section thereof.
(c) When the cold air supply is taken
wholly from the outside of the building the
supply duct at its most contracted area
must equal or exceed eighty per cent(80%)
of the combined area of all warm air pipes
leading from the furnace.
(d) Cold air ducts,except as stated in(f),
shall be constructed of metal, tile or other
non-combustible material having smooth
inner surface and shall maintain a constant
net area throughout their entire length.All
joints shall be made dust tight. Horizontal
rectangular return ducts shall have at least
10% greater area than vertical connecting
pipes.
(e) Where a boot or shoe is connected to the
casing at the base, the opening shall not
extend higher than a line on the level of
the top of the grate of the furnace.The width
of the shoe shall be of proper measurement
to make the area at all points at least
equal to that of the round or square pipe
to which it is connected. This boot or shoe
shall be of streamline transition construction.
(f) Wherever the space between joists is
used to convey cold air over head, all
bridging and bracing shall be removed and a
sheet metal pan shall be constructed to
extend not less than two inches (2")
below said joists. The connection from
this pan to the boot or shoe shall be made
of galvanized iron not lighter than No. 26
U. S. Standard Gauge, and shall have a
transition fitting, the top area of which
shall be at least 10%greater than the area
of the connecting pipe.
Note 7. To reduce friction, and for the sake of
cleanliness,it is recommended that the Joists and all
wooden surfaces between such Joists be lined with metal.
(g) When it is necessary to set the furnace
over a pit and connect up cold air under the
basement floor,such pit or cold air trench
shall not exceed eighteen inches (18") in
(16)
depth below the casing base ring and the
width of the trench or trenches shall be of
proper measurement to make the area at least
10%greater than the pipe to which it is con-
nected. The connection between the cold
air pipe or duct and the underground pit
shall be made with a transition fitting
as described in"(f)"of this section.
(h) The cold air face or faces shall be made
of wood,or metal. When set in floors the
top of same shall be flush with floor. Where
cold air face is placed in a seat or side wall
(whether furnished by owner, general con-
tractor or furnace contractor) the open
work of face must extend to within at
least one inch(I")of the floor line.
The free area of cold air faces shall be at
least equal to the free area of the duct
or ducts to which they are connected.
(i) The effective area of a vertical cold air
face lies within fourteen inches(14")of the
floor line,hence,the capacity of any vertical
cold air face shall be determined by multi-
plying the base line in inches by not to ex-
ceed fourteen inches(14")in height and de-
ducting for the grills or cross bars.
(j) When a fan is installed in the air
supply duct of a gravity system the same
net area of all ducts shall be maintained
as calculated under Article 3,Sections I,
2 and 3 and Article 4,Section 8(b).
Smoke Pipes
Section 9. (a) The smoke pipe shall be as short
and direct as consistent with the location
of the furnace. It shall be made of metal
not lighter than No. 24 U. S. Standard
gauge, and not less than the full size of
the collar on the furnace throughout its
entire length. It must have no opening
for attaching any fire place, stove, range,
water heater,gas or ventilating connection.
It shall be lock seamed or riveted: all
joints shall lap not less than one and
one-half inches (1%") and it shall be
rigidly secured. Cast iron smoke pipe may
be used.
(b) All smoke pipes shall be provided with
check dampers, placed on the side of the
pipe or at the end of a tee; when cast iron
smoke pipe dampers are used they must
be placed between the check damper and
the furnace and supported on both sides
of the pipe.
(c) Where the smoke pipe enters the flue,a
(1r)
1f,
1"
i'.i
thimble shall be cemented into the flue(See
Art.5 (c) k and the connections thereto
made air tight. Should any smoke pipe
come within eighteen inches (18") of any
combustible material, such combustible
material must be covered with asbestos
paper and a metal shield so fastened that
a two inch air space exists between this
shield and the combustible material. This
shield shall be no less in size than twice the
diameter of the smoke pipe and of sufficient
length to cover the combustible material at
all points.
(d) No smoke pipe shall project through
any external wall or window. No furnace
connection is to be made to a flue without
a cast iron or steel cleanout having first been
provided in the flue, (not more than eight
inches(8")below the smoke pipe opening).
The base of the flue shall be filled up to the
bottom of the clean out:all of which must
be made air tight.
Room Heaters
Section 10. Whenever furnaces or room heaters
are supported by legs not less than five
inches (5") high, and set on a combustible
floor,the floor under same shall be covered
with non-combustible material, extending
not less than twelve inches (12"), on sides
and back of heater and thirty-six inches
(36")in front of said heater.
Pipeless or One Pipe Furnaces
Section II. (a) When but one duplex grat-
ing is used for both warm air and cold air in
a so-called pipeless furnace,the area of the
cold air intake shall be at least equal to the
area of the warm air outlet of the grating.
Art. 4, Sec. 4, relative to casings shall not
govern when this type of furnace is installed,
but the following specification shall be
followed: The inner and outer casings of
this type of furnace may be made of either
black or galvanized iron not lighter than
No. 26 U.S. Standard Gauge. A uniform
air space shall be maintained at all points
between the inner and outer casing. In no
case shall the top of the heater be allowed
closer than twelve inches(12")to any ceil-
ing or joists above the furnace.
(b) Where joists are cut to accommodate
this furnace, headers shall be put in and
braced.
(c) Article No. 3 for determining area of
(Is)
warm air pipe shall not govern in figuring a
pipeless furnace.
(d) Where one warm air register face is
used and separate face or faces for cold air
supply are used,then Article No.4,Sections
5,7 and 8 shall apply.
ARTICLE NO.5.
The following provisions shall be made
by the owner or building contractor, in
any building wherein a gravity warm air
heating system is to be installed.
Chimney
Provide a chimney for the furnace,
constructed in a manner to comply with
the following specifications.
(a) The chimney must be absolutely smoke
tight throughout its entire length,and must
extend at least three feet (3') above a flat
roof or two feet (2') above the ridges of
peak roofs.
(b) If built of a single thickness of brick
or of cement blocks,it shall be lined through-
out its entire length with fire clay flue lining,
having not less than three-fourths inch
(%") thickness. Flue lining to be laid in
mortar and made air tight.
(c) The furnace flue must have no other
opening for attaching any fireplace,furnace,
stove, range,water heater,gas or ventilat-
ing connection. The chimney thimble shall
be furnished and installed by owner or
building contractor, of the size and in the
location specified by the Heating Con-
tractor.
(d) If necessary to offset the flue,it must
be done in such a manner as not to reduce
the cross sectional area or create a ledge
or obstruction, where loose material may
lodge.
(e) The narrowest internal dimension shall
be not less than eight inches (8") and no
flue smaller than 8" x 8" rectangular or
eight inch(8")diameter round will be con-
sidered suitable when hard coal is to be
burned,or 8"x 12"rectangular or ten inch
(10")round for soft coal or wood.
Note 8. /t 13 strongly recommended that nothing leas than
8"s/2"Internal dimensions used in any case.
Note 9. It to recommended that the height above the furnace
grate be not less than twenty-six feet(26').
Note/0. /1 is strongly recommended that all new chtmne�'be
built in.strict accordance with the ordinance recommended Si,i the
National Board of Fire Underwriters.
Furnace Foundation
The furnace foundation must be provided
by the Owner or Building Contractor as
outlined in Art.4 Sec.2-a.
(19)
Building
(a) Where warm air register boxes,heads,
pipes or stacks are to be installed, joists
shall be set not less than sixteen inches(16")
on centers and shall be butted and not
lapped. Studding shall be set directly over
and under joists, leaving a space of not
less than fourteen inches (14") between
studs and joists. Wherever joists are cut,
headers must be put in to support joists.
(b) All first story single or sub-floors shall
be continuous. In all houses having studded
exterior walls,these floors shall be extended
to the outside sheathing and all spaces be-
tween studding shall be closed at the attic
line.
Note I I. It is strongly recommended that the attic
he tightly floored or ceilings insulated to reduce
heal losses.
(c) All partition walls(or sections of these
walls) in which heat stacks to second or
third floor rooms are to be installed,shall be
of sufficient size to accommodate stacks re-
quired to heat said rooms.
Outline
Page
Art. I—Meaning of Terms. 5
Art.2—Certified Measurements 5
Art.3—Formulas 6
Sec. 1-8—Working Rules. 6-10
Sec.9—Furnace Rating Formula. 0
Humidity 0
Second Floor Heating 1
Gas or Oil Fired Furnaces. 1
Art.4—Installation. 1
Sec. I—Location of Furnaces 1
Sec.2—Foundation 1
Sec.3—Setting Furnace 2
Sec.4—Casings 2
a.Portable
b.Brick Set
Sec.5—Basement Pipes 13
Sec.6—Wall Stacks 14
a.Single
b.Double
a:} Method of Installation
Sec.7—Registers 15
Sec.8—Air Supply to Furnace 15-17
Sec.9—Smoke Pipes 17
Sec. 10—Room Heaters 18
Sec. II—Pipeless Furnaces 18
Art.5—Provisions in Building by Owner
or Builder. 19
(20)
•
. AN-ORDINANCE
AN ORDINANCE ADOPTING the
` Standard Cede-for the Installation of
Gravity Warm Air Heating Systems in
buildings need for human habitation •
sand providing penalties for the viola-
f ion of.the provisiione of said code.
Be it ordained by the Board of OOm.
mlesioaere of Salt Leke City,Utah:
Sthe.S 1. ThCU the eighth edition ■1'1 g4gyT off 1ub1trattuu
Of the SthnOf Gravity.Oode Regulating the �, JJIgVfp04.►►11�l�. 4g 1
tugtSystem ofbuildg.Used
Air for Heat-
ing Eyabmh in adopted,tppr for and
man habitation adopted,W approved and
ingiss Ad bytha National
., the Air Heat.
Society
tyeociation,epti Inc., the ding S-
oceere of Heating as VenNational
Ae Sol En-
0mShort the ntiac Is
of Sheet Metal ContractorsakeCitys he or.
"adopted,by Salt Lake u the er-• :alit!
Cainin et,rules to dand i regulationse bIC per-
' taml¢gq((warm air heatlnng the tame i- SS.
elnbuildins,usedfortihumnhbite AKE
3 of eaid code city;
herebydamended by
adding to raid article a new section'to
'be known 943 section 3A,which shall,
reed ae follow.:
9A.In determining the B.t.u.loss
of any structure coming under thin
Bede by the use of the constants and s
It i0et definitely reecognised(Article 3)
• HARRY.',7ALEE
apply to the ordinary building When
'the aforesaid rules and constants are '
applied to the individual room and the
to o heat
tionfof the a slrtu eaeoe g being first duly sworn, deposes and says, that he is the Principal Clerk
Sped by each individual room.Where
a structure differs from the ordinary
residence,
tgdrr pester than that lthat where
thin ordinarye , of the SALT LAKE DAILY TRIBUNE, a newspaper
erslaence or where more than two'air
published in
changes per hour are required, the
,r foregoing rules shall not be used,,but
tshallobel heat determined bytthe etaesneera Salt Lake City, Salt Lake County,State of Utah.
method Awing Coefficients of 'heat
transfer. Should it'be desired tO con,
etruct a building whose wall construc-
tion does not come under one of the That the Notice..A11-.-(:IMI:ALT-C.E.
city• engineer
icatio s set out in this soda,the..
shall determine or shall
be assured to his entire satisfaction as
W the coefficient of heat transfer for : 1t �„ C IT N
such material or such combination of Z C i P'C Ht1 T I
materials and-such coefficient Of beat
beused shall be used in determining the
, tout B.t.u...to be provided for by
the furnace.And Article 3 Se further amended by
adding to said article a new eectlun to
be known as Section 10,which obeli
read as'follows,to wit:
SEC.10: All warm air heating fur-
naces installed within the Loorporata
ake
limits of the City of Salt Lake and
thi
cod
b
rat
iomting ithi t.us co e shell by be add of which a copy is hereto attached, was first published in said news-
-engineer or his authorized ioDreseata-
tive when said'furnaces are.treed.tp
burn fuels ordinarily available in the
City of Salt Lake;the terml"be- paper in its issue dated the 191:Z1
of till
Sag defined for purposes of tine code"
as bituminous,coal;Coke,fuel.Oil O¢1O1r
neee the
er has not been eattieffed d es to the N C V e m be r
rating of any warm air hooting fur-- day of , 193 2
nape offered for installation within, r
the corporate limits of the City Of Salt
Lake or combination of midi furnace and was published in each daily issue of said newspaper, on
and stoker,in B,t.u:a at the bonnet,
then in that event he eh rate said,
furnace according formulato and rule I 19th.
est out In Section 9 of the Standard° November
Code Regulating the Installation"offor
. Gravity Warm Air Heating Systems for -
Residences,
And said code le further amended by, (.41e insertion
6 umineranli entirely therefrom Article thereafter, the full period of
and in lieu thereof Article 3 Abell'
read as follows
•Article.e. Any structure coming
within this code shall be provided With
a chlinney Which shall be constructed the last publication thereof
conformance
in conformance with"A Standard Or-
dinance for Chimney Construction"
recommended by the National Board Of-
Pire Underwriters, third edition, re- being in the issue dated the
vieed 1937. The minimum net dimen 19tk1 day of
anon of such chimney shell not be lees
than la mchee nor!hall the mos.lac- n
anal,area be less in square inches 1z oV embe r L
than the total B.t.n,loss of the: ,A.D. 19
etruCture divided by 1900. The mini-
mum height of chimney shall be such
so that when a furnace is metalled the' /
height or said chimney will be not lees
than 31 feet.above the grate of,said S
EI.
SECCTION 3. All taped i warm did air
heatlhg systems metalled m bWidi
La aCltyandallinstallation masod for•human habitatiOn nit- Li sworn to before me this 19th day of
•etmetum work Incidental therein shall
etrlotiy complq With and conform'W-
the provision.of the Standard Warm
.Air Heating Code end amendments mb.er ,A.D. 193 2
adopted 1n Section 1,of this °sell-'.
nano.
• SECTION 3, This cote may be cited
and designated aa.the Standard Warm
..Air Heating Code. -.
.SECTION 4.-.Any Parton vWlating
of She pvrOvisions O.f the Standard Wsm
• air Heating Cade shall,mien cornea- Notary Public.
�'. in ouon thereof,
sume no•t be
gggone hundred
dollar..($100.00),or by.lmptiednment
in the city-jall for a Deriodnot exceed-
ing thirty(30)days,or by both ankh',
• fine-and Smprieoament. The court
may,In impoeidg a fine,enter as part,
• of the judgment that,•in default of
_payment,
yment,of the firle,the defer t"
ay be imprisoned in'the city-fan
■period,not exceeding six-months,
SECTION 8. In the Opinion of.the Advertising
eery to t ie v sot,ri nith'andlesafetyyeootf g fee,$
'the lnbabitente of Salt Lake City that'
this ordinance take effect immediately.
SECTION a This ordinance shall. 'I
take.effect upon Its first nubllcatione
Passepd by the Board of Commiesion-
erg of Salt Lake City,Utabo On-the 17th,
day of-November,A.D.1893322 -
JOHN hf$NICOPP
Temporary Chairegan
�PH ,MACDONALD
Oitf^Recorder,
Bail NNop 3�. "
-,Ptajllehed November 19llosbfk 1.•,;
1
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