14
3.3.3
– Sidewall Clearance Specifications
Direct Vent Terminal Clearances
Canadian Installations
1
US Installations
2
A
Clearance above grade, veranda, porch, deck, or balcony
12” (30 cm)
12” (30 cm)
B
Clearance to window or door that may be opened
12” (15 cm) for appliances
<100,000 Btuh (30kW)
36” (91cm) for appliances
>100,000 Btuh (30kW)
9” (23 cm) for appliances
<50,000 Btuh (15kW)
12” (30cm) for appliances
>50,000 Btuh (15kW)
C
Clearance to window or door that may be opened
-
-
D
Clearance to permanently closed window
-
-
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’ (91 cm) within a height of 15’
(4.5 m) above the meter/ regulator
assembly
-
I
Clearance to service regulator vent outlet
36” (91 cm)
-
J
Clearance to non-mechanical air supply inlet to building or the
combustion air inlet to any other appliance
12” (15 cm) for appliances
<100,000 Btuh (30kW)
36” (91cm) for appliances
>100,000 Btuh (30kW)
9” (23 cm) for appliances
<50,000 Btuh (15kW)
12” (30cm) for appliances
>50,000 Btuh (15kW)
K
Clearance to a mechanical air supply inlet
6’ (1.83 m)
3’ (91 cm) above if within 10’ (3
m) horizontally
L
Clearance above paved sidewalk or paved driveway located on
public property
7’ (2.13 m)
α
-
M
Clearance under veranda, porch deck, or balcony
12” (30 cm)
β
-
1
In accordance with the current CSA B149.1-15 and CSA B149.2-15 Natural Gas and Propane Installation Code
2
In accordance with ANSI Z223.1/ NFPA 54 National Fuel Gas Code
α
A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings
β
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 B149.1-15 and CSA B149.2-15. Clearance in accordance with local installation
codes and the requirements of the gas supplier
