Venting the Boiler 25
Ref
Description
Canadian Direct Vent Installations
1
US Direct Vent Installations
2
A
Clearance above grade veranda porch deck or balcony
,
,
,
,
12 in 30 cm
(
)
12 in 30 cm
(
)
B
Clearance to window or door that may be opened
36 in 91 cm
(
)
12 in 30 cm
(
)
C
Clearance to permanently closed window
*
*
D
Vertical clearance to ventilated soffit located above the
terminal within a horizontal distance of 2 ft 61 cm from
(
)
the center line of the terminal
*
*
E
Clearance to unventilated soffit
*
*
F
Clearance to outside corner
*
*
G
Clearance to inside corner
*
*
H
Clearance to each side of center line extended above
meter regulator assembly
/
3 ft 91 cm within a height
(
)
15 ft above the meter regulator
/
assembly
*
I
Clearance to service regulator vent outlet
3 ft 91 cm
(
)
*
J
Clearance to nonmechanical air supply inlet to building
or the combustion air inlet to any other appliance
36 in 91 cm
(
)
12 in 30 cm
(
)
K
Clearance to a mechanical air supply inlet
6 ft 1 83 m
( .
)
3 ft 91 cm above if within
(
)
10 ft 3 m horizontally
(
)
L
Clearance above paved sidewalk or paved driveway
located on public property
7 ft 2 13 m
( .
)
†
*
M
Clearance under veranda porch deck or balcony
,
,
12 in 30 cm
(
)
‡
*
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 dwellings and serves both dwellings
‡
,
,
,
.
Permitted 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