Description US Installations
1
1
Canadian
Installations
2
2
E Clearance to unventilated soffit * *
F Clearance to outside corner 6' (1.83 m)* 6' (1.83 m)*
G Clearance to inside corner 6' (1.83 m) 6' (1.83 m)*
H Clearance to each side of center line
extended above meter/regulator assembly
* 3' (91 cm) within a
height 15' above the
meter/ regulator
assembly
I Clearance to service regulator vent outlet * 6' (1.83 m)
J Clearance to non-mechanical air supply inlet
to building or the combustion air inlet to any
other appliance
4' (1.2 m) below or
to side of opening;
1' (30 cm) above
opening
3' (91 cm)
K Clearance to mechanical air supply inlet * 6' (1.83 m)
L Do not terminate above paved sidewalk or
paved driveway
Slip hazard due to
frozen condensate
Slip hazard due to
frozen condensate
M Clearance under veranda, porch, deck or
balcony
* 12" (30 cm)
3
Table 5 Vent/air inlet termination clearances
1
In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Code.
2
In accordance with the current CAN/CSA-B149 Installation Codes.
3
Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor and top of terminal, and underside of
veranda, porch, deck or balcony is greater than 1' (30 cm).
3.5.7 Sidewall vent termination
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