5
Clearance above grade, veranda,
porch, deck, or balcony
A= 6 inches (15 cm.) for appliances
£ 10,000 Btuh (3 kW), 9 inches (23
cm)
for appliances > 10,000 Btuh (3 kW)
and £ 50,000 Btuh (15 kW), 12
inches (30 cm) for appliances >
50,000 Btuh (15 kW)
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)
Clearance to nonmechanical air
supply inlet to building or the
combustion air inlet to any other
appliance
J=
Canadian Installations
Clearance to window or door that
may be opened
B=
3 feet (91 cm) above if within 10 feet
(3 m) horizontally
6 feet (1.83 m)Clearance to a mechanical air
supply inlet
K=
6 inches (15 cm) for appliances £
10,000 Btuh (3 kW), 12 inches (30
cm) for appliances > 10,000 Btuh
(30 kW), 36 inches (91 cm) for
appliances > 100,000 Btuh (30 kW)
6 inches (15 cm), for appliances £
10,000 Btuh (3 kW), 9 inches (23
cm) for appliances > 10,000 Btuh (3
kW) and £ 50,000 Btuh (15 kW), 12
inches (30 cm) for appliances >
50,000 Btuh (15 kW)
Clearance to permanently closed
window
C=
*
7 feet (2.13 m)†Clearance above paved sidewalk
or paved driveway located on
public property
L=
*
*
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
D=
*
*
*
12 inches (30 cm) ‡
1
2
†
‡
M=
Clearance to unventilated soffit
E=
* *
Clearance to outside corner
F=
* *
Clearance to inside cornerG=
* *
To each side of the center line
extended above meter/regulator
assembly
H= 3 feet (91 cm) within a height 15
feet (4.5 m) above the
meter/regulator assembly
*
*
Clearance to service regulator vent
outlet
I=
3 feet (91 cm)
*
US Installations
In accordance with the current CSA B149.1, National Gas and Propane Installation Code
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:
“Clearance in accordance with local installation codes and the requirements of the gas
supplier.”
Canadian Installations US Installations
12 inches (30 cm) 12 inches (30 cm)
1 2
1 2
Vent Terminal Clearances
E
A
A
H
H
I
K
J
X
X
C
F
INSIDE
CORNER DETAIL
FIXED
CLOSED
FIXED
CLOSED
OPERABLE
OPERABLE
VENT TERMINAL
X
AIR SUPPLY INLET
AREA WHERE TERMINAL IS NOT PERMITED
Clearance under veranda, porch,
deck, or balcony
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