6
AIR TERMINAL INSTALLATIONS
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| CANADIAN | U.S.A. |
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A | 12 INCHES | 12 INCHES | Clearance above grade, veranda porch, deck or balcony. | |
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B | 12 INCHES | 9 INCHES | Clearance to windows or doors that open. | |
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C | 12 INCHES* | 12 INCHES* | Clearance to permanently closed windows. | |
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D | 18 INCHES** | 18 INCHES** | Vertical clearance to ventilated soffit located above the terminal within | |
a horizontal distance of 2 feet from the centerline of the terminal. | ||||
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E | 12 INCHES** | 12 INCHES** | Clearance to unventilated soffit. | |
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F | 0 INCHES | 0 INCHES | Clearance to an outside corner wall. | |
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| 0 INCHES*** | 0 INCHES*** | Clearance to an inside | |
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2 INCHES*** | 2 INCHES*** | Clearance to an inside combustible corner wall or protruding com- | ||
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| bustible obstructions ( vent chase, etc.). | |||
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H | 3 FEET | 3 FEET**** | Clearance to each side of the centerline extended above the meter | |
/ regulator assembly to a maximum vertical distance of 15ft. | ||||
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I | 3 FEET | 3 FEET**** | Clearance to a service regulator vent outlet. | |
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J | 12 INCHES | 9 INCHES | Clearance to a | |
combustion air inlet to any other appliance. | ||||
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K | 6 FEET | 3 FEET† | Clearance to a mechanical air supply inlet. | |
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L | 7 FEET‡ | 7 FEET**** | Clearance above a paved sidewalk or paved driveway located on | |
public property unless fitted with a heat shield kit | ||||
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M | 12 INCHES†† | 12 INCHES**** | Clearance under a veranda, porch, deck or balcony. | |
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N | 16 INCHES | 16 INCHES | Clearance above the roof. | |
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O | 2 FEET†* | 2 FEET†* | Clearance from an adjacent wall including neighbouring buildings. | |
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*Recommended to prevent condensation on windows and thermal breakage
**It is recommended to use a heat shield and to maximize the distance to vinyl clad soffits.
***The periscope
****This is a recommended distance. For additional requirements check local codes.
†Three feet above if within 10 feet horizontally.
‡A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single fami
dwellings and serves both dwellings.
††Permitted only if the veranda, porch, or deck is fully open on a minimum of two sides beneath the floor.
†* Recommenced to prevent recirculation of exhaust products. For additional requirements check local codes.
