Lennox ML195UH Installation Instructions Manual page 24

FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA
D
E
B
L
VENT TERMINAL
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
vent outlet
J = Clearance to non−mechanical air
supply inlet to building or the com-
bustion air inlet to any other ap-
pliance
K = Clearance to mechanical air sup-
ply inlet
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. Lennox recommends avoiding this location if possible.
VENT TERMINATION CLEARANCES
INSIDE CORNER
A
B
C
Fixed
Closed
F
Operable
B
B
AIR SUPPLY INLET
US Installations
12 inches (305mm) or 12 in. (305mm)
above average snow accumulation.
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)
* 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
*
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)
3 feet (.9m) above if within 10 feet
(3m) horizontally
* 7 feet (2.1m)
*12 inches (305mm)‡
FIGURE 27
Page 24
DETAIL
G
B
Fixed
Operable
Closed
J
A
AREA WHERE TERMINAL
IS NOT PERMITTED
1
6 inches (152mm) for appliances <10,000
* 12"
*
3 feet (.9m)
6 inches (152mm) for appliances <10,000
*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."
H
I
M
Canadian Installations
12 inches (305mm) or 12 in. 305mm)
above average snow accumulation.
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)
* 12"
* Equal to or greater than soffit depth * 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)
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)‡
K
2