Install Instructions

12
Venting continued-
Figure 1a – Direct Vent and Powered Direct Vent Terminal Clearances
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)
12 inches
(30 cm)
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)
12 inches
(30 cm)
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) ‡
12 inches
(30 cm) ‡
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”.