13
Letter
CDN Installation
US Installation
Description
A
30cm 12”
Clearance above grade, verandah, porch, deck, or balcony.
B
30cm
9”
Clearance from window or door that may be opened.
C
38cm* 15”*
Clearance from permanently closed window (to prevent condensation)
D
56cm 22”
Vertical clearance to ventilated soffit located above the terminated
within a horizontal distance of 2 feet (60cm) from the center line of
terminal.
E
56cm* 22”*
Clearance to unventilated soffit.
F
38cm* 15”*
Clearance to outside corner.
G
38cm* 15”*
Clearance to inside corner.
H
91cm within a height of
4.5m above the
meter/regulator
assembly
3’ within a height of 15’
above the meter/regulator
assembly.*
Clearance to each side of center line extended above meter/regulator
assembly.
I
91cm
3’*
Radial clearance around service regulator vent outlet.
J
30cm
9”
Clearance to non-mechanical air supply inlet to building, or the
combustion air inlet to any other appliance.
K
1.83m
3’ above if within 10’
horizontally.
Clearance to mechanical air supply inlet.
L
2.13mt
7’*t
Clearance above paved sidewalk or paved driveway located on public
property.
M
56cm +
22” +
Clearance under verandah, porch, deck, or balcony.
1 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2 In accordance with the current ANSI 2223.1 NFPA 54, National Fuel Gas Code.
* These Numbers are only estimates. Clearances are in accordance with local installation codes and the requirements
of the gas supplier.
t A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family
dwellings and it serves both dwellings.
+ Permitted only if verandah, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
NOTE: Venting terminals shall not be recessed into walls or siding.
Minimum Vent Termination Clearances
