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DIRECT VENT TERMINAL CLEARANCES
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| Canadian Installations1 | U.S. Installations 2 |
A= | Clearance above grade, | 12 in. (30 cm) | 12 in. (30 cm) |
| veranda, porch, deck or |
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| balcony. (See |
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B= | Clearance to window or | 6 in. (15 cm) for appliances | 6 in. (15 cm) for appliances |
| door that may be opened. | 10,000 Btuh (3 kW), 12 in. (30 cm) for | 10,000 Btuh (3 kW), 9 in. (23 cm) for |
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| appliances > 10,000 Btuh (3 kW) and | appliances > 10,000 Btuh (3 kW) and |
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| 100,000 Btuh (30 kW), 36 in. (91 cm) | 50,000 Btuh (15 kW), 12 in. (30 cm) for |
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| for appliances > 100,000 Btuh (30 | appliances > 500,000 Btuh (15 kW). |
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| kW). |
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C= | Clearance to permanently | * | * |
| closed window. |
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D= | Vertical clearance to ventilated soffit | * | * |
| located above the terminal within a |
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| horizontal distance of 2 feet (61 cm) |
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| from the center line of the 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. | * | * |
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H= | Clearance to each side of center | 3 ft. (91 cm) within a height 15 ft. | * |
| line extended above meter/regulator | (4.5 m) above the meter/regulator |
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| assembly. | assembly. |
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| Canadian Installations 1 | U.S. Installations 2 |
I= | Clearance to service | 3 ft. (91 cm). | * |
| regulator vent outlet. |
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J= | Clearance to nonmechanical air | 6 in. (15 cm) for appliances 10,000 | 6 in. (15 cm) for appliances 10,000 |
| supply inlet to building or the | Btuh (3 kW), 12 in. (30 cm) for | Btuh (3 kW), 9 in. (23 cm) for |
| combustion air inlet to any other | appliances > 10,000 Btuh (3kW) and | appliances > 10,000 Btuh (3kW) and |
| appliance. | 100,000 Btuh (30 kW), 36 in. (91 cm) | 50,000 Btuh (15 kW), 12 in. (30 cm) for |
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| for appliances > 100,000 Btuh (30 kW). | appliances > 50,000 Btuh (15 kW). |
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K= | Clearance to a mechanical | 6 ft. (1.83 m) | 3 ft. (91 cm) above if within |
| air supply inlet. |
| 10 ft. (3 m) horizontally. |
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L= | Clearance above paved sidewalk or | 7 ft. (2.13m) † | * |
| paved driveway located on public |
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| property. |
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M= | Clearance under veranda, porch, | 12 in. (30 cm) ‡ | * |
| deck or balcony. |
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1In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2In 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 fanily 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.
*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, the following statement shall be included:
“Clearance in accordance wtih local installation codes and the requirements of the gas supplier and the manufacturer’s installation instruction.”
OTHER THAN DIRECT VENT TERMINAL CLEARANCES
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| Canadian Installations 1 | U.S. Installations 2 |
A= | Clearance above grade, | 12 in. (30 cm) | 12 in. (30 cm) |
| veranda, porch, deck or |
|
|
| balcony. (See |
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|
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|
|
B= | Clearance to window or | 6 in. (15 cm) for appliances | 4 ft. (1.2 m) below or to side of |
| door that may be opened. | 10,000 Btuh (3 kW), 12 in. (30 cm) for | opening; 1 ft. (300 m) above opening. |
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| appliances > 10,000 Btuh (3 kW) and |
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| 100,000 Btuh (30 kW), 36 in. (91 cm) |
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| for appliances > 100,000 Btuh (30 |
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| kW). |
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C= | Clearance to permanently | * | * |
| closed window. |
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D= | Vertical clearance to ventilated soffit | * | * |
| located above the terminal within a |
|
|
| horizontal distance of 2 feet (61 cm) |
|
|
| from the center line of the 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. | * | * |
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H= | Clearance to each side of center | 3 ft. (91 cm) within a height 15 ft. | * |
| line extended above meter/regulator | (4.5 m) above the meter/regulator |
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| assembly. | assembly. |
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| Canadian Installations1 | U.S. Installations2 |
I= | Clearance to sevice | 3 ft. (91 cm). | * |
| regulator vent outlet. |
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J= | Clearance to nonmechanical air | 6 in. (15 cm) for appliances 10,000 | 4 ft. (1.2 m) below or to side of |
| supply inlet to building or the | Btuh (3 kW), 12 in. (30 cm) for | opening; 1 ft. (300 m) above opening. |
| combustion air inlet to any other | appliances > 10,000 Btuh (3kW) and |
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| appliance. | 100,000 Btuh (30 kW), 36 in. (91 cm) |
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| for appliances > 100,000 Btuh (30 kW). |
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K= | Clearance to a mechanical | 6 ft. (1.83 m) | 3 ft. (91 cm) above if within |
| air supply inlet. |
| 10 ft. (3 m) horizontally. |
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L= | Clearance above paved sidewalk or | 7 ft. (2.13m) † | 7 ft. (2.13m) |
| paved driveway located on public |
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| property. |
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M= | Clearance under veranda, porch, | 12 in. (30 cm) ‡ | * |
| deck or balcony. |
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1In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
†A vent shall not terminate directly above a sidewalk or paveable driveway that is located between two single family dwellings and serves both dwelling.
‡Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor.
*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, the following statement shall be included:
“Clearance in accordance wtih local installation codes and the requirements of the gas supplier and the manufacturer’s installation instruction.”
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