Item
• There must be a clearance of 24" (600mm)
or more in front of the Flue terminal.
• This restriction will not be applied to an
area where an effective shield makes a
clearance of 24" (600mm) or more in
front of the exhaust outlet.
Clearance Requirements from Vent Terminations to Building Openings
* All clearance requirements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code,
ANSI Z223.1.
Maintain the following clearances to any
opening in any building:
For installations in the USA,
• 4' below, 4' horizontally from, or 1'above
any door, operable window, or gravity air inlet
into any building.
3' above any forced air inlet within 10'.
8
Check
<When supplying combustion air from the indoors>
Illustration
There must be no
12" (300mm)
building opening
or more
within this area.
Flue terminal
12" (300mm)
or more
12" (300mm)
12" (300mm)
or more
or more
Illustration
4' *
4' *
1' *
3' *