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 and in Canada, in accordance with NSCNGPIC.
[ For
Maintain the following clearances to any opening in any building:
In- |
| • 1.2m (4') below, 1.2m (4') horizontally from, | |
| or 0.3m (1') above any door, operable win- | ||
is |
| dow, or gravity air inlet into any building. | |
HeaterWhen | Indoors | ||
0.9m (3') above any forced air inlet within | |||
|
| ||
|
| 3m (10'). | |
Clearances | stalled |
| |
Vent |
|
| |
- |
| • 0.3m (1') below, 0.3m (1') horizontally from, | |
isIn | Cap | ||
or 0.3m (1') above any door, operable | |||
Heater | Venta | ||
window, or gravity air inlet into any building. | |||
|
| ||
|
| 0.9m (3') above any forced air inlet within | |
VentClearancesWhen | stalledOutdoorsWith | 3m (10'). | |
(Noritz vent cap) | |||
|
|
Illustration
1.2m (4')
1.2m (4')
0.3m (1')
0.9m (3')
0.3m (1') 
0.3m (1')
0.3m (1')
0.9m (3')
*For Installations in Canada, clearances are as follows: To windows, doors, & gravity air inlets: 900mm (36").
To forced air inlets: 1.8m (6'). These clearance requirements hold true for all of the above situations: Indoor, Outdoor w/vent cap.
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