10
U.S. Installations
1
Canadian Installations
2
A
Clearance above grade, veranda, porch, deck, or
balcony
1' (30 cm)
1' (30 cm)
B
Clearance to window or door that may be opened
4' (1.2 m) below or to side of
opening, minimum 1 ft. (30
cm) above opening
10' (305 cm)
C
Clearance to permanently closed window
*
*
D
Vertical clearance to ventilated soffit located above the
terminal within a horizontal distance of 2' (61 cm) from
the centerline of the terminal
5' (1.5 m)
*
E
Clearance to unventilated soffit
*
*
F
Clearance to outside corner
*
*
G
Clearance to inside corner
6' (1.83 m)
*
H
Clearance to each side of center line extended above
meter/regulator assembly
*
3' (91 cm) within a height 15'
(457 cm) above the meter/
regulator assembly
I
Clearance to service regulator vent outlet
*
6' (183 cm)
J
Clearance to non-mechanical air supply inlet to
building or the combustion air inlet to any other
appliance
4' (1.2 m) below or to side of
opening; 1' (30 cm) above
opening
3' (91 cm)
K
3' (91 cm) above if within
10' (3 m) horizontally
6' (183 cm)
L
Clearance above paved sidewalk or paved driveway
located on public property
Slip hazard due to frozen
condensate
Slip hazard due to frozen
condensate
4
M
Clearance under veranda, porch, deck or balcony
*
12" (30 cm)
3
1 In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Code.
2 In accordance with the current CAN/CSA-B149 Installation Codes.
3
Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor and top of terminal, and underside
of veranda, porch, deck or balcony is greater than 1' (30 cm).
4
Vent terminal shall not terminate directly above sidewalk or paved driveway located between 2 single family dwellings that serves both
dwellings
*
Clearances in accordance with local installation codes and the requirements of the gas supplier.
Table E. Vent/Air Inlet Termination Clearances
A
INSIDE
CORNER DET
AIL
V = VENT
X = AIR INLET
F10692
V
G
H
A
B
B
V
V
B
B
V
A
J
X
I
M
V
X
K
V
V
B
F
C
OPERABLE
FIXED
CLOSED
FIXED
CLOSED
OPERABLE
D
L
B
E
V
V
Figure 5. Minimum Clearances from Vent/Air Inlet Terminations – Indoor and Outdoor Installations
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