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6.7 Side Venting Terminal Requirements of
• USA - National Fuel Gas Code, ANSI Z223.1/NFPA 54.
Venting terminal from doors and windows
Venting terminal from forced air inlet of other appliances
Venting terminal from snow level
Venting terminal from vegetation
Venting terminal from public walkway
FIGURE 6-15
FIGURE 6-16
Forced Air
Inlet
FIGURE 6-17
3' (914mm)
Minimum
6 - COMBUSTION AIR AND VENT PIPING
Termination must be
min. 12" (305mm)
from or below doors,
windows or gravity
inlet. If boiler uses
inside air min. 4'
(1219 mm).
Termination
12"
(305mm)
Min.
Termination
3' (0.9m)
[If located
within 10' (3m)
of forced air inlet]
Less Than
10' (3m)
Minimum
:
Doors &
Windows
Condensate
Forced Air
Inlet
Grade, Snow
& Ice
"L"
Corner
30
See figure 6-15
See figure 6-16
See figure 6-17
See figure 6-18
See figure 6-19
Combustion air and vent termination
must be min. 12" (305mm) from or
below doors, windows or gravity inlet. If
boiler uses inside air min. 4' (1219 mm).
Vent gas may condense, forming
moisture, may be corrosive. Protect
building materials at vent from exhaust of
vent gas.
Terminate venting system minimum 3'
(914mm) above and 10' (3.0m) from
any forced air inlet (except boiler's
combustion air inlet).
Maintain 12"(305mm) US, 18"(457mm)
Canada clearance above highest
anticipated snow level, 24" (610mm)
above roof.
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.
Vent termination shall NOT be installed
closer than 3' (914mm ) from inside
corner of "L" shaped structure.
PN 240011320 Rev. G 10/01/2021]
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