ii
[_ AIR SUPPLY INLET D AREA WHERE TERMINAL IS NOT PERMITED
Item Clearance Description
A Clearance above grade, veranda, porch, deck, balcony, or
anticipated snow level
B Clearance to a window or door that may be opened
C
D
E
F
G
H
I
J
Clearance to a permanently closed window
Vertical clearance to a ventilated soffit located above the *
terminal within a horizontal distance of 2' (61cm) from the
centedine of the terminal
Clearance to an unventilated soffit *
Clearance to an outside corner
Clearance to an inside comer
Clearance to each side of the centedine extended above
eleclrical meter or gas service regulator assembly
Clearance to service regulator vent outlet
Clearance to non-mechanical air supply inlet to building or
the combustion air inlet to any other appliance
Canadian Installation (1)
12" (30cm)#
6" (15 cm) for appliances _< 10,000 BTUH (3kW), 12" (30
cm) for appliances > 10,000 Btuh (3 kW) and _<100,000 Btuh
(30 kW), 36" (91 cm) for appliances > 100,000 Btub (30 kW)
3' (91 cm) within 15' (4.5 m) above the meter/regulator
assembly
3' (91 cm)
6" (15cm)forappliances_<10,OOOBTUH(3kW),g" (23cm)
forappliances> 10,000Btuh (3kW) and _<100,000Btuh(30
kW) and _<50,000Btuh(15kW), 12" (30 cm)for appliances
> 50,000Btuh(15kW)
K Clearance to a mechanical air supply inlet 6' (1.83 m)
L Clearance under a veranda, porch, deck, or balcony 12" (30 cm) +
M Clearance to each side of the centedine extended above or 12" (30 cm)
below vent terminal of the furnace to a dryer or water heater
vent, or other appliance's direct vent intake or exhaust.
N Clearance from a plumbing vent stack 3' (91 cm)
O Clearance above a paved sidewalk or paved driveway located 7' (2.13 m)
on public property.
(1.) In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
(2,) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Cede
# 18" (46 cm) above roof surface
+ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides benealh the floor.
U.S. Installation (2)
12" (30 cm)
6" (15 cm) for appliances _< 10,000 BTUH (3kW), 0" (23 cm)
for appliances > 10,000 Btuh (3 kW) and _<50,000 Btuh (15
kW), 12" (30 cm) for appliances > 50,000 Btuh (15 kW)
3' (91 cm) within 15' (4.5 m) above the meter/regulator
assembly
6" (15cm)forappliances_<10,OOOBTUH(3kW),9" (23cm)
for appliances>10,000Btuh(3 kW)and _<50,000Btub(15
kW),12" (30 cm)forappliances> 50,000Btuh (15kW)
3' (91 cm) above if within 10' (3m) horizontally
12" (30 cm)
3' (91 cm)
7' (2,13 m)
For dearances not specified in ANSI Z223.1/N FPA 54 or C SA B149,1, clearances shall be in accordance with local installation codes and the requirements of the gas supplier and the manufacture's installatio
instructions.
A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
Notes:
1, The vent for this appliance shall not terminate
a. Over public walkways; or
b. Near soffit vents or crawl space vents or other areas where condensate or vapor could create a nusiance or hazard or property damage; or
c. Where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other equipment.
2. When locating vent terminations, consideration must be given to prevailing winds, location, and other conditions which may cause recirculation of the combustiob products of adjacent vents.
Recirculation can cause poor combustion, inlet condensate problems, and accelerated corrosion of the heat exchangers.
[_ 440O1102102
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