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Canada U.S.A
Direct vent and
other than Direct Vent
Direct vent
Other than Direct Vent
A
Clearance above grade, veranda, porch,
deck, or balcony.
1 foot
1 foot
1 foot
B
Clearance to window or door that may be
opened.
3 feet
1 foot
4 feet from below or
side opening. 1 foot
from above opening.
C Clearance to permanently closed window
*
*
*
D
Vertical clearance to ventilated soffit located
above the vent terminator within a horizontal
distance of 2 feet (61cm) from the center
line of the terminator.
* * *
E Clearance to unventilated soffit
*
*
*
F Clearance to outside corner
*
*
*
G Clearance to inside corner
*
*
*
H
Clearance to each side of center line
extended above meter/regulator assembly
3 feet
*
*
I Clearance to service regulator vent outlet.
3 feet
*
*
J
Clearance to non-mechanical air supply inlet
to building or the combustion air inlet to any
other application.
3 feet
1 foot
4 feet from below or
side opening. 1 foot
from above opening.
K Clearance to mechanical air supply inlet.
6 feet
3 feet
3 feet
L
Clearance above paved sidewalk or paved
driveway located on public property.
7 feet
*
7 feet
M
Clearance under veranda, porch deck, or
balcony.
1 foot
*
*
*For clearances not specified in ANSI Z223.1 / NFPA 54 or CAN/CSA-B149.1, please use clearances in
accordance with local installation codes and the requirement of the gas supplier.
