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Other than Direct Vent (Outdoor): Termination Clearances
Figure 17: Outdoor Termination Clearances
Ref
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
Vertical clearance to ventilated soffit, located above the terminal within a
D
horizontal distance of 2 ft (61 cm) from the center line of the terminal
E
Clearance to unventilated soffit
F
Clearance to outside corner
G
Clearance to inside corner
Clearance to each side of center line extended above meter/regulator
H
assembly
I
Clearance to service regulator vent outlet
Clearance to non-mechanical air supply inlet to building or the
J
combustion air inlet to any other appliance
K
Clearance to a mechanical air supply inlet
Clearance above paved sidewalk or paved driveway located on public
L
property
M
Clearance under veranda, porch, deck, or balcony
1
Notes:
In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
[1] A vent shall not terminate directly above a sidewalk or paved driveway that
is located between two single family dwellings and serves both dwellings.
[2] Permitted only if veranda, porch, deck, or balcony is fully open on a mini-
mum of two sides beneath the floor.
If locally adopted installation codes specify clearances different than those illustrated, then the most stringent clearance shall prevail. 36 inches minimum from the
top of the water heater to the overhang. The area under the overhang must be open on 3 sides.
Description
Clearance to opposite wall is 24 in. (60 cm).
I
(ANSI Z223.1/NFPA 54)
Other than direct vent (Outdoor unit)
4 ft (1.2 m) below or to side of opening; 1 ft (300 mm) above opening
4 ft (1.2 m) below or to side of opening; 1 ft (300 mm) above opening
3 ft (91 cm) above if within 10 ft (3 m) horizontally
Vents for Category II and IV appliances cannot be located above public
walkways or other areas where condensate or vapor can cause a nuisance
* Clearances are in accordance with local installation codes and the
requirements of the gas supplier.
AIR SUPPLY INLET
VENT TERMINAL
AREA WHERE TERMINAL IS
NOT PERMITTED
Regulator vent outlet
1
U.S. Installations
12 in. (30 cm)
*
*
*
*
12 in.
*
*
or hazard.
*
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