Figure 3.
Direct Vent Terminal Clearances
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| Canadian Installations1 | US Installations2 | |
A= | Clearance above grade, veranda, porch, deck or balcony | 12 inches (30 cm) | 12 inches (30 cm) | |
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B= | Clearance to widow or door that may be opened | 36 inches (91 cm) | 12 inches (30 cm) | |
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C= | Clearance to permanently closed widow | *b | *b | |
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D= | Vertical clearance to ventilated soffit located above the terminal within a | 12 inches (30 cm) *a | 12 inches (30 cm) *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 | |
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F= | Clearance to outside corner | *b | *b | |
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G= | Clearance to inside corner | *b | *b | |
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| 3 feet (91 cm) within a |
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H= | Clearance to each side of center line extended above meter/regulator | height 15 feet (4.6 m) | *b | |
assembly | above the meter/regulator | |||
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| assembly |
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I= | Clearance to service regulator vent outlet or oil tank vent | 36 inches (91 cm) | *b | |
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J= | Clearance to | 36 inches (91 cm) | 12 inches (30 cm) | |
inlet to any other appliance | ||||
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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 located on public | 7 feet (2.13 m)† | *b | |
property | ||||
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M= | Clearance under a veranda, porch, deck, or balcony | 12 inches (30 cm) ‡ | 12 inches (30 cm) ‡ |
1In accordance with the current
2In accordance with the current ANSI
† A vent must not terminate directly above a sidewalk or paved driveway that is located between two
‡Permitted only if a veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. *a) A minimum clearance value determined by testing in accordance with section 2.20.
*b) “Clearance in accordance with local installation codes and the requirements of the gas supplier”.
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