13
Sidewall Vent Terminal Clearances—Nondirect Vented Furnaces (Horizontal Venting)
Vent Terminal
Air Supply Intake
Area Where Terminal Is
Not Permitted
X
Inside
Corner Detail
A
V
G
V
H
K
V
X
M
I
A
J
X
V
B
B
B
B
V
V
Fixed
Closed
B
V
V
C
V
B
V
E
D
L
F
Fixed
Closed
Operable
Operable
U.S. Installations
1
A
Clearance above grade, veranda, porch, deck, or balcony
12" (30.5 cm)
B
Clearance to window or door that may be opened
48" (121.9 cm) below or to side of opening; 12"
(30.5 cm) above opening
C
Clearance to permanently closed window
*
D
Vertical clearance to ventilated soffit located above the terminal within a
horizontal distance of 24" (61 cm) 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 extended above meter/regulator
assembly
*
I
Clearance to service regulator vent outlet
*
J
Clearance to nonmechanical air supply inlet to building or the combustion
air inlet to any other appliance
48" (121.9 cm) below or to side of opening; 12"
(30.5 cm) above opening
K
Clearance to a mechanical air supply inlet
36" (91.4 cm) above if within 10 ft (3 m) horizontally
L
Clearance above paved sidewalk or paved driveway located on public
property
7 ft (2.1 m)
M
Clearance under veranda, porch, deck, or balcony
*
1
In accordance with the current ANSI Z2223.1/NFPA 54, National Fuel Gas Code.
*Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation
instructions.
