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D
E
B
L
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 (610mm)
from the center line of the terminal
E =
Clearance to unventilated soffit
F =
Clearance to outside corner
G =
Clearance to inside corner
H =
Clearance to each side of center line ex-
tended above meter / regulator assembly
I =
Clearance to service regulator
J =
Clearance to non-mechanical air
supply inlet to building or the com-
bustion air inlet to any other ap-
K =
Clearance to mechanical air sup-
L =
Clearance above paved sidewalk or
paved driveway located on public property
M =
Clearance under veranda, porch, deck or balcony
1
In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code
2
In accordance with the current CSA B149.1, Natural Gas and Propane Installation 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. Comfort-Aire / Century recommends avoiding this location
if possible.
Page 22 of 53
VENT TERMINATION CLEARANCES
FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA
C
Fixed
Closed
F
Operable
B
VENT TERMINAL
3 feet (.9m) within a height 15 feet (4.5m)
vent outlet
pliance
ply inlet
Figure 28. Vent Termination Clearances
For Direct Vent installations in the USA and Canada
INSIDE CORNER
DETAIL
G
A
B
Operable
B
A
AIR SUPPLY INLET
1
US Installations
12 inches (305mm) or 12 in. (305mm)
above average snow accumulation.
6 inches (152mm) for appliances <10,000
Btuh (3kw), 9 inches (228mm) for ap-
pliances > 10,000 Btuh (3kw) and <50,000
Btuh (15kw), 12 inches (305mm) for ap-
pliances > 50,000 Btuh (15kw)
* 12"
* Equal to or greater than soffit depth
* Equal to or greater than soffit depth
* No minimum to outside corner
*
above the meter / regulator assembly
*
3 feet (.9m)
6 inches (152mm) for appliances <10,000
Btuh (3kw), 9 inches (228mm) for ap-
pliances > 10,000 Btuh (3kw) and <50,000
Btuh (15kw), 12 inches (305mm) for ap-
pliances > 50,000 Btuh (15kw)
3 feet (.9m) above if within 10 feet
(3m) horizontally
* 7 feet (2.1m)
*12 inches (305mm)‡
Issue 1933
H
B
I
Fixed
Closed
J
AREA WHERE TERMINAL
IS NOT PERMITTED
Canadian Installations
12 inches (305mm) or 12 in. (305mm)
above average snow accumulation.
6 inches (152mm) for appliances <10,000
Btuh (3kw), 12 inches (305mm) for
appliances > 10,000 Btuh (3kw) and
<100,000 Btuh (30kw), 36 inches (.9m)
for appliances > 100,000 Btuh (30kw)
* Equal to or greater than soffit depth
* Equal to or greater than soffit depth
* No minimum to outside corner
3 feet (.9m) within a height 15 feet (4.5m)
above the meter / regulator assembly
3 feet (.9m)
6 inches (152mm) for appliances <10,000
Btuh (3kw), 12 inches (305mm) for
appliances > 10,000 Btuh (3kw) and
<100,000 Btuh (30kw), 36 inches (.9m)
for appliances > 100,000 Btuh (30kw)
6 feet (1.8m)
7 feet (2.1m)†
12 inches (305mm)‡
*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA
B149.1, clearance will be in accordance with local installation
codes and the requirements of the gas supplier and these
installation instructions."
M
K
2
* 12"
*
507735-03
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