Part 5 - Vent /air - intake termination clearances
Warning
The quick reference table below is to be read in conjunction with the numbered notes as indicated and the Venting Rules
and Guidelines in Section 4. The instructions detailed in this section are a combination of
specific and National
Gas Code restrictions. Compliance alone doesn’t insure a satisfactory installation as good common sense must also be
applied. Failure to follow these instructions may result in fire, property damage, serious injury or death.
Table 5-1 Termination Clearances Quick Reference Table
Clearances to Air-Inlet Termination
Canada
1
Min. Distance
Above roofline and snow level
2
305 mm (12”)
Above roof line - Concentric Vent
3,4
610 mm (24”)
To exhaust vent from any other appliance
915 mm (36”)
Clearances to Exhaust Vent Termination
Min. Distance
Window, door or building opening
915 mm (36”)
To combustion air inlet from any other appliance
915 mm (36”)
Non-mechanical air supply inlet to building
915 mm (3
6”)
Mechanical air supply inlet to building
1.83 m (6 ft.)
Soffit, overhang, eave or parapet
610 mm (24”)
Soffit vent or vent opening in an overhang, eave or parapet
1.83 m (6 ft.)
Outside corner
5
-
Inside corner of an L-shaped structure (including walls and fences) 36
915 mm (36”)
Electric meters, gas meters, regulators and relief equipment
1.83 m (6 ft.)
Each side of center line above or below meters, regulators and relief
915 mm (36”)
devices
6
Above a paved sidewalk, driveway, or parking lot on public property if
2.13 m (7 ft.)
adjacent
7
Above a sidewalk, driveway, or parking lot on public property
X
Above a sidewalk, driveway on private property between / serving both
X
dwellings
Under a concrete veranda, porch, deck, or balcony
8
610 mm
(24”)
Above, under or near exterior stairs
X
Into a canopy or carport
X
1 - Canadian installations must comply with the current CSA B149.1 Installation Code and local building codes.
2 -
610 mm (24”) is the recommended snow level allowance above grade/roofline or any surface that will support snow, debris, or ice (i.e. for roof venting clearances -
roofline and snow level). If living in a snowfall region, consult your local weather office for the maximum typical snowfall for your area.
3 - Concentric Vent must protru
de from the roof precisely 610 mm (24”)
4 - In Canada, concentric vent materials are subject to approval by local inspectors. 5-
Clearances to an outside corner to be in accordance with local installation codes.
6 - Horizontal clearance must be observed up to a height of 4.6 m (15 ft.) above/below the meter, regulator, or relief devices.
7 - Above public walkways, driveways or parking lots if adjacent to it and condensate cannot drip, freeze, or create a hazard.
8 - Permitted if veranda, porch, deck, or balcony is made of concrete and a minimum of two sides are fully open beneath.
X
-
Not permitted by National gas code(s) and/or recommended by appliance manufacturer.
30
R Series