8
Clearance Requirements from Vent Terminations to Building Openings
<When supplying combustion air from the indoors>
* All clearance requirements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code,
ANSI Z223.1 and in Canada, in accordance with NSCNGPIC.
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.
Check
Illustration
Outdoor Clearances to Opening
into Any
Building
12" (300mm)
or more
12" (300mm)
or more
There must be no
building opening
within this area.
Flue terminal
12" (300mm)
or more
12" (300mm)
or more
V
ent Clearances When Heater is In-
stalled Indoors
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'.
For installations in Canada,
• 36" (900mm) below, horizontally from, or
above any door, operable window, or gravity
air inlet into any building.
6' (1.8m) from any forced air inlet.
Maintain the following clearances to any
opening in any building:
Illustration
4' *
4' *
3' *
1' *
* Clearances for USA only.
