27
Doors &
Windows
Combustion air and vent termination
must be 12" (305mm) from or below
doors, windows or gravity inlet.
Forced Air
Inlet
Terminate venting system 3’ (0.9m)
above and 10' (3.0m) from any forced
air inlet (except boiler’s combustion
air inlet).
"L"
Corner
Vent termination shall NOT be installed
closer than 3' (0.9m) from inside
corner of “L” shaped structure.
Grade, Snow
& Ice
Terminate vent system bottom,
minimum 12" (300 mm) above highest
anticipated snow level.
Avoid locations where snow may drift
and block vent and combustion air. Ice
or snow may cause boiler to shut down
if vent or combustion air becomes
obstructed.
Condensate
Vent gas may condense, forming
moisture, may be corrosive. Protect
building materials at vent from exhaust
of vent gas.
Termination must be
12" (305mm) from
or below doors,
windows or gravity
inlet.
12"
(305mm)
Minimum
Termination
Forced Air
Inlet
3' (0.9m)
[If located
within 10' (3m)
of forced air
inlet]
Termination
Less than
10' (3m)
Minimum
3' (0.9m)
Minimum
FIGURE 6-12
FIGURE 6-13
FIGURE 6-14
6.7 Side Venting Terminal Requirements of :
• USA - National Fuel Gas Code, ANSI 223.1/NFPA 54.
• Canada - Natural Gas and Propane Installation Code, CAN/CSA B149.1
Venting terminal from doors and windows See gure 6-12
Venting terminal from forced air inlet of other appliances See gure 6-13
Venting terminal from snow level See gure 6-14
Venting terminal from vegetation See gure 6-15
Venting terminal from public walkway See gure 6-16
6 - COMBUSTION AIR AND VENT PIPING
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