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| Installer’s Guide | |
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| Table 12 - See Figure 27 |
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| Direct Vent Terminal Clearances |
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| Canadian Installations |
| US Installations | |
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| A= | Clearance above grade, veranda, porch, deck, or | 12 inches (30 cm) |
| 12 inches (30 cm) | |
| balcony |
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| 6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 12 | 6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 9 | ||
| B= | Clearance to window or door that may be opened | inches (30 cm) for appliances > 10,000 Btuh (3 kw) and =/< | inches (23 cm) for appliances > 10,000 Btuh (3 kw) and =/< | ||
| 100,000 Btuh (30 kw), 36 inches (91 cm) for appliances > | 50,000 Btuh (15 kw), 12 inches (30 cm) for appliances > 50,000 | ||||
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| 100,000 Btuh (30 kw) | Btuh (15 kw) | ||
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| C= | Clearance to permanently closed window | * | * |
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| Vertical clearance to ventilated soffit located above the |
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| D= | terminal within a 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 line extended above | 3 feet (91 cm) with a height 15 feet (4.5 m) above the | * |
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| meter/regulator assembly | meter/regulator assembly |
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| I= | Clearance to service regulator vent outlet | 3 feet (91 cm) | * |
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| 6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 12 | 6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 9 | ||
| J= | Clearance to nonmechanical air supply inlet to building | inches (30 cm) for appliances > 10,000 Btuh (3 kw) and =/< | inches (23 cm) for appliances > 10,000 Btuh (3 kw) and =/< | ||
| or the combustion air inlet to any other appliance | 100,000 Btuh (30 kw), 36 inches (91 cm) for appliances > | 50,000 Btuh (15 kw), 12 inches (30 cm) for appliances > 50,000 | |||
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| 100,000 Btuh (30 kw) | Btuh (15 kw) | ||
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| K= | Clearance to a mechanical air supply inlet | 6 feet (1.83m) |
| 3 feet (91 cm) above if within 10 feet (3m) horizontally | |
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| L= | Clearance above a paved sidewalk or paved driveway | 7 feet (2.13 m) † | * |
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| located on public property |
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| M- | Clearance under veranda, porch, deck, or balcony | `12 inches (30 cm) ‡ | * |
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Notes:
1.In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code.
2.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 dwelling and serves both dwellings.
‡. Pemitted 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.
Table 12A - See Figure 27
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A= | Clearance above grade, veranda, porch, deck, or | 12 inches (30 cm) | 12 inches (30 cm) | |
balcony | ||||
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| 6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 12 |
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B= | Clearance to window or door that may be opened | inches (30 cm) for appliances > 10,000 Btuh (3 kw) and =/< | 4 feet (1.2m) below or to the side of opening; 1 foot (0.3m) | |
100,000 Btuh (30 kw), 36 inches (91 cm) for appliances > | above opening. | |||
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| 100,000 Btuh (30 kw) |
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C= | Clearance to permanently closed window | * | * | |
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| Vertical clearance to ventilated soffit located above the |
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D= | 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 line extended above | 3 feet (91 cm) with a height 15 feet (4.5 m) above the | * | |
meter/regulator assembly | meter/regulator assembly | |||
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I= | Clearance to service regulator vent outlet | 3 feet (91 cm) | * | |
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| 6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 12 |
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J= | Clearance to nonmechanical air supply inlet to building | inches (30 cm) for appliances > 10,000 Btuh (3 kw) and =/< | 4 feet (1.2 m) below or to side of opening; 1 foot (300 m) above | |
or the combustion air inlet to any other appliance | 100,000 Btuh (30 kw), 36 inches (91 cm) for appliances > | opening | ||
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| 100,000 Btuh (30 kw) |
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K= | Clearance to a mechanical air supply inlet | 6 feet (1.83m) | 3 feet (91 cm) above if within 10 feet (3m) horizontally | |
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L= | Clearance above a paved sidewalk or paved driveway | 7 feet (2.13 m) † | 7 feet (2.13 m) | |
located on public property | ||||
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M= | Clearance under veranda, porch, deck, or balcony | `12 inches (30 cm) ‡ | * | |
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Notes:
1.In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code.
2.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 dwelling and serves both dwellings.
‡. Pemitted 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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