Requirements for terminating the venting
WARNING: Venting terminals must not be recessed into a wall or siding.
In addition, the following must be observed:
VENTING
1
in accordance with the current csa-B149. 1
Natural Gas and Propane Installation Code
2
in accordance with the current ansi Z223.1 / 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 veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* For clearances not specified in ANSI Z223. 1 / NFPA 54 or CSA-B149.1, one of the following shall be indicated:
a) a minimum clearance value determined by testing in accordance with section 2.19.6, or;
b) a reference to the following footnote:
“clearance in accordance with local installation codes and the requirements of the gas supplier”
«Dégagement conforme aux codes d’installation locaux et aux exigences du foumisseunde gaz»
a=
clearance above grade,
veranda, porch, deck, or balcony
B=
clearance to window or door
that may be opened
c=
clearance to permanently
closed window
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
E=
Clearance to unventillated soffit
F=
clearance to outside corner
G=
clearance to inside corner
h=
clearance to each side of
center line extended above
meter/regulator assembly
i=
clearance to service regulator
vent outlet
J=
clearance to nonmechanical
air supply inlet to building or
the combustion air inlet to any
other appliance
K=
clearance to a mechanical air
supply inlet
L=
clearance above paved sidewalk
or paved driveway located on
public property
M=
clearance under veranda, porch
deck, or balcony
12 inches (30 cm)
6 inches (15 cm) for appliance
<
10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances
>
10,000 Btuh (3kW) and
<
100,000 Btuh (30 kW), 36 inches (91 cm)
for aplliances > 100,000 Btuh (30 kW)
*
*
*
*
*
3 feet (91 cm) within a height of 15
feet above the meter/ regulator assembly
6 feet (1.83 m)
6 inches (15 cm) for appliances
<
10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances
>
10,000 Btuh (3 kW) and
<
100,000 Btuh (30 kW), 36 inches (91 cm)
for appliances
>
100,000 Btuh (30 kW)
6 feet (1.83 m)
7 feet (2.13 m) †
12 inches (30 cm) ‡
12 inches (30 cm)
6 inches (15 cm) for appliance
<
10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances
>
10,000 Btuh (3kW) and
<
50,000 Btuh (15 kW), 12 inches (30 cm)
for aplliances > 50,000 Btuh (15 kW)
*
*
*
*
*
*
*
6 inches (15 cm) for appliance
<
10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances
>
10,000 Btuh (3kW) and
<
50,000 Btuh (15 kW), 12 inches (30 cm)
for aplliances > 50,000 Btuh (15 kW)
3 feet (91 cm) above if within 10 feet
(3 m) horizontally
*
*
Canadian Installations
1
US Installations
2
