Fig. 3: Minimum Clearances from Vent/Air Inlet Terminations – Indoor and Outdoor Installations
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| U.S. Installations1 | Canadian Installations2 | |
A | Clearance above grade, veranda, porch, | 1 ft (30 cm) | 1 ft (30 cm) | |
deck, or balcony | ||||
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| Clearance to window or door that may be | 4 ft (1.2m) below or to side |
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B | of opening; 1 foot (30 cm) | 3 ft (91 cm) | ||
opened | ||||
| above opening |
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C | Clearance to permanently closed window | * | * | |
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| Vertical clearance to ventilated soffit located |
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D | above the terminal within a horizontal dis- | 5 ft (1.5m) | * | |
tance of 2 ft (61cm) from the centerline of the | ||||
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| terminal |
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E | Clearance to unventilated soffit | * | * | |
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F | Clearance to outside corner | * | * | |
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G | Clearance to inside corner | 6 ft (1.83m) | * | |
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| Clearance to each side of center line ex- |
| 3 ft (91 cm) within a height | |
H | * | 15 ft above the me- | ||
tended above meter/regulator assembly | ||||
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| ter/regulator assembly | ||
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I | Clearance to service regulator vent outlet | * | 6 ft (1.83m) | |
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| Clearance to | 4 ft (1.2m) below or to side |
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J | to building or the combustion air inlet to any | of opening; 1 ft (30 cm) | 3 ft (91 cm) | |
| other appliance | above opening |
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K | Clearance to mechanical air supply inlet | 3 ft (91 cm) above if within | 6 ft (1.83m) | |
10 ft (3m) horizontally | ||||
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L | Clearance above paved sidewalk or paved | 7 ft (2.13m) | 7 ft (2.13m) t | |
driveway located on public property | ||||
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M | Clearance under veranda, porch, deck or | * | 12 in. (30 cm) TT | |
balcony | ||||
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1In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Code
2In accordance with the current
t Vent terminal shall not terminate directly above sidewalk or paved driveway located between 2 single family dwellings that serves both dwellings
TTPermitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor and top of terminal and
underside of veranda, porch, deck or balcony is greater than 1 ft (30cm)
* Clearances in accordance with local installation codes and the requirements of the gas supplier
Table B: Vent/Air Inlet Termination Clearances
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