DescriptionRef
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
D=
Vertical clearance to ventilated soffit located above the
terminal within a horizontal distance of 2 feet (61 cm)
from the center line of the terminal
E=
Clearance to unventilated soffit
F=
Clearance to outside corner
G=
Clearance to inside corner
H=
Clearance to each side of center line extended 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
K=
Clearance to a mechanical air supply inlet
L=
Clearance above paved sidewalk or paved driveway located
on public property
Clearance under veranda, porch, deck, or balcony
M=
1
In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code
* Clearance in accordance with local installation codes and the requirements of the gas supplier.
Clearance to opposite wall is 24 inches (60 cm).
*
*
*
*
*
*
*
*
3 ft (91 cm) above if within
10 ft (3 m) horizontally
*
12 in (30 cm)
4 ft (1.2 m) below or to side of opening;
1 ft (30 cm) above opening
4 ft (1.2 m) below or to side of opening;
1 ft (30 cm) above opening
US Non-Direct Vent Installations
1
Vent Terminal
D
E
B
B
F
B
A
G
H
I
C
B
M
K
J
B
B
L
Air Supply Inlet
Area Where Terminal
is Not Permitted
A
ANSI Z223.1.
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