100299634_2000545244_ Rev. A
25
TERMINATION CLEARANCES (SIDE WALL)
Vent terminal
Air supply inlet
Area where terminal is not permitted
FIXED
CLOSED
INSIDE
CORNER
DETAIL
OPERABLE
FIXED
CLOSED
OPERABLE
Gas meter
/ regulator
V
X
X
V
V
V
V
V
V
V
V
V
B
B
B
B
B
J
A
K
M
F
B
L
D
I
X
G
A
C
L
Figure 20.
Power Direct Vent Terminal Clearances
1
A above grade,
veranda, porch,
deck, or balcony
12 in.
I to regulator vent
outlet
Not applicable
B to window or
door that may be
opened
6 in.
for appliances ≤10,000 BTUh (3 kW),
9 in.
for appliances > 10,000 BTUh (3 kW)
and ≤ 50,000 BTUh (15 kW),
12 in. for appliances > 50,000 BTUh (15
kW)
J to non-mechanical
air supply inlet
to building or the
combustion air
inlet to any other
appliance
6 in.
for appliances ≤ 10,000 BTUh (3 kW),
9 in.
for appliances > 10,000 BTUh (3 kW)
and ≤ 50,000 BTUh (15 kW),
12 in. for appliances > 50,000 BTUh (15 kW)
C to window or
door that is
permanently
closed
0 in.
K to a mechanical air
supply inlet
3 ft. above if within 10 ft. horizontally
D to soffit
12 in.
L above equipment or
public walkways
†
F to outside corner
24 in.
M under veranda,
porch deck, or
balcony
12 in. ‡
G to inside corner
18 in.
1 In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Code
† The vent shall not terminate over public walkways or over an area where condensate or vapor could create a nuisance or hazard or could be
detrimental to the operation of regulators, relief valves, or other equipment.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
