Installation & Operating Manual

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)
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) ‡
*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.
2. Do not terminate the exhaust vent terminal where condensate or vapor could cause
damage or could be detrimental to the operation of regulators, relief valves, or other
equipment.
3. Do not terminate the exhaust vent terminal over public area or walkways where
condensate or vapor can cause nuisance or hazard.
4. The vent shall terminate a minimum of 12” (25.4 cm) above expected snowfall level
to prevent blockage of vent termination.