46
Installation Manual
Exhaust Vent Termination Clearances
Fixed
closed
Fixed
closed
Operable
Operable
Vent terminal
Legend:
Regulator
vent outlet
Inside
corner detail
Air supply inlet
Area where terminal is not permitted
Canadian Direct Vent
Installation
1)
U.S. Direct Vent
Installation
2)
A Clearance above grade, veranda, porch, deck or balcony 12 in. (30 cm) 12 in. (30 cm)
B Clearance to window or door that may be opened 36 in. (91 cm) 12 in. (30 cm)
C Clearance to permanently closed window * *
D
Vertical clearance to ventilated soffit located above the vent termination within
a horizontal distance of 2 feet (61cm) from the center line of the termination
* *
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
36 in. (91 cm) within a height 15 feet
above meter/ regulator assembly
*
I Clearance to service regulator vent outlet 36 in. (91 cm) *
J
Clearance to non-mechanical air supply inlet to building or the combustion air
inlet to any other application
36 in. (91 cm) 12 in. (30 cm)
K Clearance to mechanical air supply inlet 72 in. (182 cm)
36 in. (91 cm) above if
within 10 feet horizontally
L Clearance above paved sidewalk or paved driveway located on public property 84 in. (213 cm)
3)
*
M Clearance under veranda, porch deck or balcony 12 in. (30 cm)
4)
*
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.
3) A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
4) 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 CSAB149.1, one of the following shall be indicated:
a) A minimum clearance value determined by testing in accordance with section 2.20, or;
b) A reference to the following footnote:
“Clearance in accordance with local installation codes and the requirements of the gas supplier.”
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