18
Direct Vent Terminal Clearances
D
V
V
E
FIXED
CLOSED
O
P
ERAB
LE
O
PERABLE
FIXED
CLOSED
v
v
B
L
F
C
B
v
v
v
X
B
B
B
A
J
B
I
H
X
v
M
K
v
G
A
V Vent Terminal X Air Supply Inlet Area Where Terminal Is Not Permitted
US Installations
1
A = Clearance above grade, veranda, porch,
deck or balcony
12 inches (30 cm)
B = Clearance to window or door that may be
opened
6 inches (15 cm) for appliances ≤ 10,000 Btuh (3 kW), 9
inches (23 cm) for appliances > 10,000 Btuh (3kW) and ≤
50,000 Btuh (15 KW), 12 inches (30 cm) for appliances>
50,000 Btuh (15 kW)
C = Clearance to permanately closed window *
D = Vertical clearance to ventilated soft lo-
cated above the terminal within a horizontal
distance of 2 feet (61 cm) from the center
line of the terminal
*
E - Clearance to unventilated soft *
F - Clearance to outside corner *
G - Clearance to inside corner *
H - Clearance to each side of centerline extend-
ed 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
6 inches (15 cm) for appliances ≤ 10,000 Btuh (3 kW), 9
inches (23 cm) for appliances > 10,000 Btuh (3kW) and ≤
50,000 Btuh (15 KW), 12 inches (30 cm) for appliances>
50,000 Btuh (15 kW)
K - Clearance to a mechanical air supply inlet 3 feet (91 cm) above if within 10 feet (3 m) horizontally
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 Z223.1/ NFPA 54 National Fuel Gas Code
* For clearances not specied in ANSI Z223.1/ NFPA 54 the following statement shall be included:
"Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer's installation
instructions".
Installing the Water Heater
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