Specifications

9
Installation (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 widow 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
widow
*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
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”.
The vent system must terminate so that proper clearances are maintained as cited in
local codes or the latest edition of the National Fuel Gas Code, ANSI Z223.1.73.4e and
7.8a, b as follows:
1. Do not terminate near soffit vents or crawl space or other area where
condensate or vapor could create a nuisance or hazard or cause property
damage.