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506725-01Page 20 of 48 Issue 1109
FIGURE 24
VENT TERMINATION CLEARANCES
FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA
K
D
E
L
B
C
F
G
A
B
J
A
M
I
H
INSIDE CORNER
DETAIL
VENT TERMINAL
AIR SUPPLY INLET
AREA WHERE TERMINAL
IS NOT PERMITTED
Fixed
Closed
Operable
B
Fixed
Closed
Operable
B
B
A =
B =
C =
D =
E =
F =
G =
H =
I =
J =
K =
L =
M =
US Installations
1
Canadian Installations
2
12 inches (305mm) or 12 in. 305mm)
above average snow accumulation.
12 inches (305mm) or 12 in. 305mm)
above average snow accumulation.
Clearance above grade, veranda,
porch, deck or balcony
Clearance to window or
door that may be opened
6 inches (152mm) for appliances <10,000
Btuh (3kw), 9 inches (mm) for appliances
> 10,000 Btuh (3kw) and <50,000 Btuh
(15 kw), 12 inches (305mm) for ap-
pliances > 50,000 Btuh (15kw)
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)
Clearance to permanently
closed window
Vertical clearance to ventilated sot
located above the terminal within a
horizontal distance of 2 feet (mm)
from the center line of the terminal
Clearance to unventilated sot
Clearance to outside corner
Clearance to inside corner
Clearance to each side of center line ex-
tended above meter / regulator assembly
Clearance to service regulator
vent outlet
Clearance to non−mechanical air
supply inlet to building or the com-
bustion air inlet to any other ap-
pliance
Clearance to mechanical air sup-
ply inlet
Clearance above paved sidewalk or
paved driveway located on public property
Clearance under veranda, porch,
deck or balcony
* 12"
*
* 7 feet (2.1m)
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), 9 inches (mm) for appliances
> 10,000 Btuh (3kw) and <50,000 Btuh
(15 kw), 12 inches (305mm) for ap-
pliances > 50,000 Btuh (15kw)
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)
3 feet (.9m) above if within 10 feet
(3m) horizontally
6 feet (1.8m)
1
In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code
2
In accordance with the current CSA B149.1, Natura l Gas and Prop ane Installation Code
*For clearances not specied in ANSI Z223.1/NFPA 54 or CSA B149.1, clear-
ance will be in accordance with local installation c odes and the requirements
of the gas supplier and these installation instructions."
between two single family dwellings and serves both dwellings.
sides beneath the oor. Lennox recommends avoiding this location if possible.
* 12"
* Equal to or greater than sot depth
* Equal to or greater than sot depth* Equal to or greater than sot depth
* Equal to or greater than sot depth * Equal to or greater than sot depth
* No minimum to outside corner
* No minimum to outside corner
3 feet (.9m) within a height 15 feet (4.5m)
above the meter / regulator assembly
3 feet (.9m)
*
*