9
Vent Clearances When Heater is In-
stalled Indoors
• 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'.
Maintain the following clearances to any
opening in any building:
Illustration
(Noritz vent cap)
• 1' below, 1' 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 outdoor installation, use the outdoor
vent cap.
If it is necessary to vent above the roof line
in an outdoor installation, also use the base
of the vent cap for rain protection.
Vent Clearances When Heater is In-
stalled Outdoors With a Vent Cap
* 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.
* For Installations in Canada, clearances are as follows: To windows, doors, & gravity air inlets: 36".
To forced air inlets: 6'. These clearance requirements hold true for all of the above situations: Indoor,
Outdoor w/vent cap.
3'
1'
4'
4'
3'
1'
1'
1'
Clearance Requirements from Vent Terminations to Building Openings
