TERMINATION CLEARANCES SIDEWALL POWER VENT
INSIDE CORNER
DETAIL
FIXED
CLOSED
OPERABLE
FIXED
CLOSED
OPERABLE
Vent terminal
Air supply inlet
Area where is not permitted
Gas meter / regulator
C
B
B
B
B
B
J
A
K
M
F
B
L
E
D
I
V
V
V
V
V
V
V
V
V
V
X
X
X
G
A
Figure 28.
Vent terminal clearances for “Power Vent” installations. Power Vent con
fi
gurations use room air for combustion.
A
Clearance above grade,
veranda, porch, deck or
balcony
12 in.
H
Clearance to each side of
center line extended above
meter/regulator assembly
N/A
B Clearance to window or door
that may be opened
4 ft. below or to side
of opening; 1 ft.
above opening
I
Clearance to service regulator
vent outlet
3 ft.*
C Clearance to permanently
closed window
12 in.*
J
Clearance to a non
mechanical air supply inlet into
building or combustion air inlet
to any other appliance
4 ft. below or to side
of opening; 1 foot
above opening.
D
Vertical clearance to ventilated
sof
fi
t located above the
terminal within a horizontal
distance of 2 ft. from the
center line of the terminal
12 in.*
K Clearance to a mechanical air
supply inlet
3 ft. above if within
10 ft. horizontally
E Clearance to unventilated
sof
fi
t
12 in.*
L
Clearance above paved
sidewalk or paved driveway
located on public property
7 ft.†
F Clearance to outside corner
2 ft.*
M Clearance under veranda,
porch, deck, or balcony
12 in.‡
G Clearance to inside corner
18 in.*
In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family
dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the
fl
oor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the
manufacturer’s installation instructions.
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