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Edison Installation and Operation Manual
4.4.1 Permitted Termination Location
Refer to NFPA 211 (USA) or CSA B365 (Canada) for rules for the distance of exit terminal
from windows and openings. The exit terminal of a mechanical draft system, other than a
direct vent appliance (see Section 4.4.1.1: Direct Vent System (2-in-1 Exhaust and
fresh air intake)) shall be located in accordance with the following.
Canada:
Min.
Letter
clearances
A
12'' (30 cm)
B*
39'' (100 cm)
F
39'' (100 cm)
H
39'' (100 cm)
I
72'' (183 cm)
J
39'' (100 cm)
K
72'' (183 cm)
L
84'' (213 cm)
39'' (100 cm)
20
Clearances above grade level or any adjacent surface that might
support snow, ice, or debris
Clearance to window or door that may be opened
Clearance to corner or adjacent wall
Not to be installed above a meter/regulator assembly within 39" (100
cm) horizontally from the vertical center-line of the regulator and for 15'
vertically
Clearance to gas service regulator vent outlet or within 39'' (100 cm) of
an oil tank vent or an oil tank fill inlet
Clearance to the combustion air inlet to any other appliance
Clearance to a mechanical air supply inlet
Clearance above paved side-walk or a paved driveway located on
public property
Clearance to property boundary
A vent shall not terminate underneath a veranda, porch, or deck
Description
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