Termination Clearances Sidewall Direct Vent
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| DIRECT VENT |
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| (using outdoor air for combustion) |
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| EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION |
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| FIXED |
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| V | FIXED |
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| OPERABL | CLOSED |
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| CLOSED |
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| OPERABL | E |
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V | VENT TERMINAL | X AIR SUPPLY INLET |
| AREA WHERE TERMINAL IS NOT PERMITTED | ||||||||||
Figure 14
Vent terminal clearances for “Direct Vent” installations. Direct Vent configurations use outdoor air for combustion.
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| US Installations 1 |
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| US Installations 1 | |
| Clearance above grade, |
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| Clearance to each side | 3 feet (91 cm) within a height | |
A | veranda, porch, deck or | 12 inches (30 cm) | H | of center line extended | 15 feet (4.5 m) above the | |
above meter/regulator | ||||||
| balcony |
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| assembly | meter/regulator assembly* | |
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| 6 inches (15 cm) |
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| for appliances up to |
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| 10,000 Btu/hr (3 kW), |
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| 9 inches (23 cm) for |
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B | Clearance to window or | appliances between | I | Clearance to service | 3 feet (91 cm)* | |
door that may be opened | 10,000 Btu/hr (3 kW) | regulator vent outlet | ||||
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| and 50,000 Btu/hr (15 |
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| kW), 12 inches (30 cm) |
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| for appliances above |
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| 50,000 Btu/hr (15 kW) |
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| 6 inches (15 cm) for | |
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| Clearance to a non | appliances up to 10,000 | |
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| Btu/hr (3 kW), 9 inches (23 | ||
| Clearance to |
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| mechanical air supply | ||
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| J | cm) for appliances between | |||
permanently closed | 6 inches (15 cm)* | inlet into building or | ||||
10,000 Btu/hr (3 kW) and | ||||||
| window |
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| combustion air inlet to | 50,000 Btu/hr (15 kW), 12 | |
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| any other appliance | ||
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| inches (30 cm) for appliances | ||
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| above 50,000 Btu/hr (15 kW) | |
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| Vertical clearance to |
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| ventilated soffit located |
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| Clearance to a |
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D | above the terminal within | 12 inches (30 cm)* | K | 3 feet (91 cm) above if within | ||
mechanical air supply | ||||||
a horizontal distance of | 10 feet (3 m) horizontally | |||||
| 2 feet (61 cm) from the |
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| inlet |
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| center line of the terminal |
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| Clearance above |
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E | Clearance to unventilated | 12 inches (30 cm)* | L | paved sidewalk or | 7 feet (2.13 m)†* | |
soffit | paved driveway located | |||||
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| on public property |
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F | cornerClearance to outside |
| M | Clearance under |
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2 feet (60 cm)* | veranda, porch, deck, | 12 inches (30 cm) ‡* | ||||
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| or balcony |
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G | cornerClearance to inside | 18 inches (45 cm)* |
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1 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
†A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.
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