Table of Contents
Advertisement
Sidewall Vent Terminal Clearances—Direct Vented Furnaces (Horizontal Venting)
D
E
V
B
V
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 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
K
Clearance to a mechanical air supply 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 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.
Inside
Corner Detail
G
V
A
Fixed
Closed
C
B
V
V
V
F
B
B
B
Operable
H
Operable
B
V
X
V
J
A
Fixed
Closed
U.S. Installations
1
12" (30.5 cm)
6" (15.2 cm) for appliances less than 10,000 Btu/h, 9" (22.9 cm) for
appliances greater than 10,000 Btu/h, and less than or equal to
50,000 Btu/h, 12" (30.5 cm) for appliances greater than
50,000 Btu/h
*
*
*
*
*
*
*
6" (15.2 cm) for appliances less than or equal to 10,000 Btu/h, 9"
(22.9 cm) for appliances greater than 10,000 Btu/h, and less than
or equal to 50,000 Btu/h, 12" (30.5 cm) for appliances greater than
50,000 Btu/h
36" (91.4 cm) above if within 10 ft (3 m) horizontally
*
*
V
Vent Terminal
X
Air Supply Intake
Area Where Terminal Is
Not Permitted
I
M
X
V
K
15
Advertisement
Table of Contents
