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Sidewall Vent Terminal Clearances—Nondirect Vented Furnaces (Horizontal Venting)
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 ft 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.
Connect Venting
1. Using a ¹⁄₄" sheet metal screw, secure the vent pipe to the
inducer blower outlet.
2. Make sure all vent connections do not leak.
3. Check that the venting is open, and that it is the correct size.
4. Check that the vent pipe terminates outside the building.
U.S. Installations
12"
4 ft below or to side of opening; 12" above opening
*
*
*
*
*
*
*
4 ft below or to side of opening; 12" above opening
3 ft above if within 10 ft horizontally
7 ft
*
Install Ductwork
IMPORTANT:
Install ductwork in accordance with NFPA 90B and any local
codes.
If there is no complete return air duct system, the return air
connection must be sealed to the furnace casing and run full
size to a location outside the utility room or space housing
the furnace to avoid a negative pressure on the venting
system.
Vent Terminal
V
Air Supply Inlet
X
Area Where Terminal Is
Not Permitted
1
13
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