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Installer's
Guide
Non-Direct
Vent Terminal Clearances
Canadian
Installations
US Installations
Clearance above grade, veranda, porch, deck, or
12 inches (30 cm)
12 inches (30 cm)
A=
balcony
6 inches (15 cm) for appliances
=/< 10,000 Btuh (3 kw), 12
inches (30 cm) for appliances
> 10,000 Btuh (3 kw) and =/<
4 feet (1.2m) below or to the side of opening; 1 foot (0.3m)
B=
Clearance to window or door that may be opened
100,000 Btuh (30 kw), 36 inches (91 cm) for appliances
>
above opening.
100,000 Btuh (30 kw)
C=
Clearance to permanently
closed window
Vertical
clearance to ventilated
soffit located above the
D=
terminal within a horizontal
distance of 2 feet (61 cm)
from the center line of the terminal
E=
Clearance to unventilated
soffit
P=
Clearance to outside corner
G=
Clearance to inside corner
Clearance to each side of center line extended
above
3 feet (91 cm) with a height 15 feet (4.5 m) above the
H=
meter/regulator
assembly
meter/regulator
assembly
I=
Clearance to service regulator vent outlet
3 feet (91 cm)
6 inches (15 cm) for appliances
=/< 10,000 Btuh (3 kw), 12
j=
Clearance to nonmechanical
air supply inlet to building
inches (30 cm) for appliances
> 10,000 Btuh (3 kw) and =/<
4 feet (1.2 m) below or to side of opening; 1 foot (300 m) above
or the combustion
air inlet to any other appliance
100,000 Btuh (30 kw), 36 inches (91 cm) for appliances
>
opening
100,000 Btuh (30 kw)
K=
Clearance to a mechanical
air supply inlet
6 feet (1.83m)
3 feet (91 cm) above if within 10 feet (3m) horizontally
Clearance above a paved sidewalk or paved driveway
7 feet (2.13 m) 1
7 feet (2.13 m)
L=
located on public property
M=
Clearance under veranda,
porch, deck, or balcony
"12 inches (30 cm) $
Notes:
1.
In accordance
with the current CSA B149.1 Natural Gas and Propane Installation
Code.
2.
In accordance
with the current
ANSI Z223.1/NPPA
54 National Fuel Gas Code.
1". A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwelling and serves both dwellings.
$.
Pemitted only if veranda,
porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance
in accordance
with local installation
codes and the requirements
of the gas supplier and the manufacturer's
Installation
Instructions.
ELBOW AND TEE MUST
BE AS CLOSE TO-
GETHER
AS POSSIBLE
POSSIBLE CONFIGURATIONS FOR TWO PIPE VENTING SYSTEMS
18-CD19D6-27
17
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