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Item Clearance Descriptions
A Clearance above grade, veranda, porch, deck, balcony, or
anticipated snow level
B Clearance to a window or door that may be opened
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" (01 cm) for appliances > 100,000 Btub (30 kW)
C Clearance to a permanently closed window *
D Vertical clearance to a ventilated soffit located above the *
terminal within a horizontal distance of 2' (61cm) from the
centedine of the terminal
E Clearance to an unventilated soffit *
F Clearance to an outside corner *
G Clearance to an inside comer *
H Clearance to each side of the centedine extended above
electrical meter or gas service regulator assembly
I Clearance to service regulator vent outlet
J Clearance to non-mechanical air supply inlet to building or
the combustion air inlet to any other appliance
K Clearance to a mechanical air supply inlet
L Clearance under a veranda, porch, deck, or balcony
M Clearance to each side of the centedine extended above or *
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) within 15' (4.5 m) above the meter/regulator
assembly
3' (01 cm)
6" (15cm)forappliances_<10,OOOBTUH(3kW),12" (30
cm)forappliances> 10,000Btub(3kW) and _<100,000Btuh
(30 kW),36" (91 cm) for appliances> 100,000Btuh(30 kW)
6' (1.83m)
12" (30 cm) +
3' (91 cm)
U.S. Installation (2)
12" (30 cm)
4' (1,2 m) below or to the side of the opening. 1' (30 cm)
above the opening.
3' (91 cm) within 15' (4.fi m) above the meter/regulator
assembly
4' (1.2 m) below or to the side of opening: 1' (30 cm) above
opening.
3' (01 cm) above if within 10' (3m horizontally)
3' (91 cm)
(1.) In accordance with the currenl CSA B149.1, Natural Gas and Propane Installation Code
(2,) In accordance with the current ANSI Z223.1/NFPA fi4, Nafional 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 beneath the floor.
For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearances shall be in accordance with local installation codes and the requirements of the gas supplier and the manufacture's
installation instructions.
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 operafion 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 combusfiob products of adjacent vents.
Recirculafion can cause poor combustion, inlet condensate problems, and accelerated corrosion of the heat exchangers.
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