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Figure 20. Vent Terminal Clearances - National Fuel Gas Code.
Horizontal Termination Clearance
A
= Clearance above grade, veranda, porch , deck, or balcony :
*12 inches (30 cm) minimum.
B
= Clearance to window or door that may be opened:
9 inches
(23 cm) min./U.S. *12 inches (30 cm) min./ CAN
We recommend 12 inches minimum to help prevent
condensation on the window.
C
= Clearance to permanently closed window:
9 inches (23 cm)
min./U.S. *12 inches (30 cm) min./ CAN
We recommend 12 inches minimum to help prevent
condensation on the window.
D
= Vertical clearance to ventilated soffit located above the
terminal within a horizontal distance of 2 feet (60 cm) from
the centerline of the terminal:
18 inches
(46 cm) minimum.
E
= Clearance to unventilated soffit:
12 inches (46 cm)
minimum.
F
= Clearance to outside corner:
9 inches (23 cm) min.
Jøtul
N.A. strongly recommends 12 inches (30 cm), particularly
where windy conditions are prevalent.
G =
Clearance to inside corner:
6 inches (16 cm) minimum.
Jøtul N.A. strongly recommends 12 inches (30 cm), particu-
larly where windy conditions are prevalent.
H =
*Not to be installed above a meter/regulator assembly
within 3 feet (90 cm)
horizontally from the centerline of the
regulator.
I
= Clearance to service regulator vent outlet:
U.S. - 3 feet
CAN. 6 feet (1.8 m) minimum.
J
= Clearance to nonmechanical air supply inlet to building or
the combustion air inlet to any other appliance:
*12 inches
(30 cm) minimum.
K
= Clearance to a mechanical air supply inlet:
*6 feet
(1.8 m) minimum.
* As specified in CGA B149 Installation Codes. Note: Local Codes and
Regulations may require different clearances.
**
A vent shall not terminate directly above a sidewalk or driveway
which is located between two single family dwellings and serves
both dwellings.*
1
Only permitted if veranda, porch, deck, or balcony, is fully open on a
minimum of two sides beneath the floor.*
Figure 21. Termination Clearance to overhangs.
3
76 mm
12
305
mm
2 1/2
64 mm
L =
** Clearance above paved sidewalk or a paved driveway
located on public property:
*7 feet (2.1 m) min.
M
= Clearance under veranda, porch, deck, or balcony:
*12
inches (30 cm) minimum.
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