Lennox 97G2DFV Installation Instructions Manual page 25

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
In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code
1
In accordance with the current CSA B149.1, Natural Gas and Propane Installation
2
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. Avoiding this location is recommended if possible.
508405-01
VENT TERMINATION CLEARANCES
FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA
C
Fixed
Closed
F
Operable
B
VENT TERMINAL
12 inches (305mm) or 12 inches (305mm)
vent outlet
pliance
ply inlet
Figure 29. 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
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
*
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 (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)‡
*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."
NOTE - This figure is intended to illustrate clearance
requirements and does not serve as a substitute for locally
adopted installation codes.
Issue 2341
H
B
I
Fixed
Closed
J
AREA WHERE TERMINAL
IS NOT PERMITTED
Canadian Installations
12 inches (305mm) or 12 inches (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)‡
M
K
2
* 12"
*
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