9
Venting continued-
Canadian
Installations
1
US
Installations
2
A=
Clearance above grade, veranda, porch, deck or
balcony
12 inches
(30 cm)
12 inches
(30 cm)
B=
Clearance to window or door that may be opened
12 inches
(30 cm)
4 feet
(1.2 m)
below or to the
side of
opening;
12 inches
(30 cm)
above
opening
C=
Clearance to permanently closed window
*b
*b
D=
Vertical clearance to ventilated soffit located
above the terminal within a horizontal distance of 2
feet (61 cm) from the center line of the terminal
*b
*b
E=
Clearance to unventilated soffit
*b
*b
F=
Clearance to outside corner
*b
*b
G=
Clearance to inside corner
*b
*b
H=
Clearance to each side of center line extended
above meter/regulator assembly
3 feet
(91 cm)
within a height
15 feet
(4.6 m)
above the
meter/regulator
assembly
*b
I=
Clearance to service regulator vent outlet or oil
tank vent
36 inches
(91 cm)
*b
J=
Clearance to non-mechanical air supply inlet to
building or the combustion air inlet to any other
appliance
12 inches
(30 cm)
4 feet
(1.2m)
below or to
side of
opening;
12 inches
(30 cm)
above
opening.
K=
Clearance to a mechanical air supply inlet
6 feet
(1.83 m)
3 feet
(91 cm)
above if within
10 feet
(3.1 m)
horizontally
L=
Clearance above paved sidewalk or paved
driveway located on public property
7 feet
(2.13 m) †
7 feet
(2.13 m) †
M=
Clearance under a veranda, porch, deck, or
balcony
12 inches
(30 cm) ‡
*b
1
In accordance with the current CAN/CGA-B149
Installation Codes
.
2
In accordance with the current ANSI Z223.1-(Latest edition)/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 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
5.21.1 of ANSI Z21.10.1, latest edition.
*b) “Clearance in accordance with local installation codes and the requirements of
the gas supplier”.
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