Figure 4
Direct Vent Terminal Clearances
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| Canadian Installations1 | US Installations2 | |
A= | Clearance above grade, veranda, porch, deck or | 12 inches (30 m) | 12 inches (30 cm) | |
balcony | ||||
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| 9 inches (23 cm) for | |
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| appliances > 10,000 Btuh | |
B= | Clearance to widow or door that may be opened | 12 inches (30 m) | (3 kW) and ≤ 50,000 | |
Btuh (15 kW), 12 inches | ||||
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| (30 cm) for appliances > | |
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| 50,000 Btuh (15 kW) | |
C= | Clearance to permanently closed widow | *b | *b | |
| Vertical clearance to ventilated soffit located above the | 12 inches (30 cm) *a | 12 inches (30 cm) *a | |
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 | 12 inches (30 cm) *a | 12 inches (30 cm) *a | |
F= | Clearance to outside corner | *b | *b | |
G= | Clearance to inside corner | *b | *b | |
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| 3 feet (91 cm) within a |
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| Clearance to each side of center line extended above | height 15 feet (4.6 m) |
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H= | above the | *b | ||
meter/regulator assembly | ||||
| meter/regulator |
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| assembly |
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I= | Clearance to service regulator vent outlet or oil tank | 36 inches (91 cm) | *b | |
vent | ||||
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| 9 inches (23 cm) for | |
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| appliances > 10,000 Btuh | |
J= | Clearance to | 12 inches (30 cm) | (3 kW) and ≤ 50,000 | |
or the combustion air inlet to any other appliance | Btuh (15 kW), 12 inches | |||
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| (30 cm) for appliances > | |
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| 50,000 Btuh (15 kW) | |
K= | Clearance to a mechanical air supply inlet | 6 feet (1.83 m) | 3 feet (91 cm) above if | |
within 10 feet horizontally | ||||
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L= | Clearance above paved sidewalk or paved driveway | 7 feet (2.13 m)† | *b | |
located on public property | ||||
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M= | Clearance under a veranda, porch, deck, or balcony | 12 inches (30 cm) ‡ | *b |
12
