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Page 29 of 53
J= Clearance to nonmechanical 6 in (15cm) for appliances ≤10,000 6 in (15cm) for appliances ≤10,000
air supply inlet to building or Btuh (3kW), 12 in (30 cm) for Btuh (3kW), 9 in (23 cm) for
the combustion air inlet to appliances >10,000 Btuh (3kW) and appliances >10,000 Btuh (3kW0 and
any other appliance ≤100,000 Btuh (30kW), 36 in (91 cm) ≤50,000 Btuh (15kW), 12 in (30cm)
for appliances >100,000 Btuh (30kW) for appliances >50,000 Btuh (15kW0
K= Clearance to a mechanical 6 ft (1.83 m) 3 ft (91 cm) above if within 10ft
air supply inlet (3 m) horizontally
L= Clearance above paved sidewalk 7 ft (2.13 m) †
or paved driveway located on
public property *
M= Clearance under veranda, 12 in (30 cm) ‡
porch deck or balcony *
0” 0”
3” 3”
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 Code
† A vent shall not terminate directly above a
sidewalk or paved driveway that is located
between two single family dwellings and
serves both dwellings
‡ 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 one of the following
shall be indicated
a). A minimum clearance value determined by
testing in accordance with section 2.23.5, or:
b). A reference to the following footnote:
“Clearance in accordance with local installation
codes and the requirements of the gas supplier.”
G= Clearance to inside corner of combustible surface
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