Heatilator • CD4236IFTR, CD4236IFTLR, CD4842IFTR, CD4842IFTLR Installation Manual • 2511-980 Rev. M
• 8/21
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Figure 4.4 Minimum Clearances for Termination
C
J
B
D
B
F
B
A
E
V
V
V
V
V
V
M
H or i
V
G
X
V
H
A
V
V
H
X
= AIR SUPPLY INLET
V
= VENT TERMINAL
= AREA WHERE TERMINAL IS NOT PERMITTED
Electrical
Service
V
K
V
K
V
L
C
V
B. Vent Terminal Clearances
U.S.A.
CANADA
A
Clearance above grade,veranda, porch, deck, or balcony
12 in. (305 mm)
12 in. (305 mm)
B
Clearance to window or door that may be opened, or to permanently closed window
U.S.A.: = 9 in. min. (229 mm min.) CANADA: = 12 in. min. ( 305 mm min.)
C
clearance below unventilated soffit
18 in. (457 mm)
18 in. (457 mm)
clearance below ventilated soffit
18 in. (457 mm)
18 in. (457 mm)
clearance below any vinyl soffits and electrical service
30 in. (762 mm)
30 in. (762 mm)
D
clearance to outside corner
6 in. (152 mm)
6 in. (152 mm)
E
clearance to inside corner
6 in. (152 mm)
6 in. (152 mm)
F
not to be installed above a gas meter/regulator assembly within 3 feet horizontally from
the center-line of the regulator
3 ft (914 mm)
3 ft (914 mm)
G
clearance to gas service regulator vent outlet
3 ft (914 mm)
3 ft (914 mm)
H
clearance to non-mechanical air supply inlet to building or the combustion air inlet to
any other appliance termination (mechanical or non-mechanical)
9 in. min.
(229 mm min.)
12 in. min.
(305 mm min.)
I
clearance to a mechanical (powered) air supply inlet
***(All mechanical air intakes within 10 feet of a horizontal termination cap must be
a minimum of 3 feet below termination.)
3 ft (914 mm)***
6 ft (1.8 m)
J
On
public
property: clearance above paved sidewalk or a paved driveway.
7 ft (2.1 m)
7 ft (2.1 m)**
**(A vent shall not terminate directly above a sidewalk or paved driveway which is located between two single family dwellings
and serves both dwellings.)
K
clearance from sides of electrical service
6 in. (152 mm)
6 in. (152 mm)
Location of the vent termination must not interfere with access to the electrical service.
L
clearance above electrical service
12 in. (305 mm)
12 in. (305 mm)
Location of the vent termination must not interfere with access to the electrical service.
M
clearance under veranda, porch, deck, balcony or overhang
*(Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of
two sides beneath the floor.)
18 in. (457 mm)
12 in. (305 mm)*
vinyl or composite overhang
42 in. (1067 mm)
42 in. (1067 mm)
U.S.A. Installations:
In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
Canadian Installations:
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
