Install Instructions

13
Venting continued-
Figure 1b – Vent Terminal Clearances (Other than Direct Vent or Powered Direct Vent
Installations)
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
*b
*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 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 2.20.
*b) “Clearance in accordance with local installation codes and the requirements of the gas supplier”.