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(*) above maximum snow level or at least 24" (610 mm) whichever is greater
VENT/AIR-INLET TERMINATION CLEARANCES
The quick reference table below is to be read in conjunction with the numbered notes as indicated in figures of the previous page, and the
Venting Rules and Guidelines in Section 8.4. The instructions detailed in this section are a combination of specific and National Gas Code
restrictions. Ensure the installation clearances are in accordance with the National Fuel Gas Code, ANSIZ223.1/NFPA 54 in the US, CAN/
CSA B149.1 in Canada, and/or applicable provisions of local building codes; the clearances shown within this manual do not supersede
these codes. Compliance alone does not insure a satisfactory installation as good common sense must also be applied.
WARNING: failure to follow these instructions may result in fire, property damage, serious injury or death.
Vent Termination Minimum Clearances
A
Clearance above grade, veranda, porch, deck, or balcony
B
Clearance to window or door that may be opened
C
Clearance to permanently closed window
Vertical clearance to ventilated soffit located above the terminal within a
D
horizontal distance of 2 feet (610mm) from the center line of the terminal
E
Clearance to unventilated soffit
F
Clearance to outside corner
G
Clearance to inside corner
Clearance to each side of centerline extended above meter/ regulator
H
assembly
US Installations
12" (305mm)
12" (305mm)
12" (305mm)
18" (457mm)
18" (457mm)
9" (229mm)
3 ft. (0.9m)
3 ft. (0.9m) within a height
of 15 ft. (4.5m) above the
meter/ regulator assembly
30
Canadian Installations
2
12" (305mm)
3 ft. (0.9m)
12" (305mm)
18" (457mm)
18" (457mm)
9" (229mm)
3 ft. (0.9m)
3 ft. (0.9m) within a height
of 15 ft. (4.5m) above the
meter/ regulator assembly
1
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