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Clearance above grade, veranda, porch, deck, or
A
balcony
B
Clearance to window or door that may be opened
C
Clearance to permanently closed window
Vertical clearance to ventilated soffit located above
D
the terminal within a horizontal distance of 2 ft (61cm)
from the centerline of the terminal
E
Clearance to unventilated soffit
F
Clearance to outside corner
G
Clearance to inside corner
Clearance to each side of center line extended above
H
meter/regulator assembly
I
Clearance to service regulator vent outlet
Clearance to non-mechanical air supply inlet to
J
building or the combustion air inlet to any other
appliance
K
Clearance to mechanical air supply inlet
Clearance above paved sidewalk or paved driveway
L
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
² In accordance with the current CAN/CSA-B149.1 Installation Codes
³ Vent terminal shall not terminate directly above sidewalk or paved driveway located between 2 single family dwellings that serves both
dwellings
⁴ 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 ft (30cm)
* Clearances in accordance with local installation codes and the requirements of the gas supplier
4 ft (1.2 m) below or to side of opening;
4 ft (1.2 m) below or to the side of
opening; 1 ft (30.5 cm) horizontally
3 ft (91 cm) above or within 10 ft (3 m)
Slip hazard due to frozen condensate
Table F.
Vent/Air Inlet Termination Clearances
U.S. Installations ¹
1 ft (30.5 cm)
1 ft (30.5 cm) above opening
*
5 ft (1.5 m)
*
*
6 ft (1.83 m)
*
*
horizontally
*
Canadian Installations ²
1 ft (30.5 cm)
10 ft (3 m)
*
*
*
*
*
3 ft (91 cm) within a height 15
ft (4.57 m) above the meter/
regulator assembly
6 ft (1.83 m)
3 ft (91 cm)
6 ft (1.83 m)
Slip hazard due to frozen
condensate ³
12 in. (30.5 cm) ⁴
9
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