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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'.
Vent Clearances When Heater is In-
stalled Outdoors With a Vent Cap
Clearance Requirements from Vent Terminations to Building Openings
* All clearance requirements are in accordance with ANSI Z21.10.3a-2003 and the National Fuel Gas
Code, ANSI Z223.1.
* 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’
