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SECTION C: Installation
8
Fig. 5: Minimum Clearances from Vent/Air Inlet Terminations – Indoor and Outdoor Installations
U.S. Installations
1
Canadian Installations
2
A
Clearance above grade, veranda, porch, deck, or
balcony
1 ft (30 cm) 1 ft (30 cm)
B Clearance to window or door that may be opened
4 ft (1.2m) below or to side
of opening; 1 foot (30 cm)
above opening
3 ft (91 cm)
C Clearance to permanently closed window
* *
D
Vertical clearance to ventilated soffit located
above the terminal within a horizontal distance of
2 ft (61cm) from the centerline of the terminal
5 ft (1.5m)
*
E Clearance to unventilated soffit
* *
F Clearance to outside corner
* *
G Clearance to inside corner 6 ft (1.83m)
*
H
Clearance to each side of center line extended
above meter/regulator assembly
*
3 ft (91 cm) within a height
15 ft above the me-
ter/regulator assembly
I Clearance to service regulator vent outlet
*
6 ft (1.83m)
J
Clearance to non-mechanical air supply inlet to
building or the combustion air inlet to any other
appliance
4 ft (1.2m) below or to side
of opening; 1 ft (30 cm)
above opening
3 ft (91 cm)
K Clearance to mechanical air supply inlet
3 ft (91 cm) above if within
10 ft (3m) horizontally
6 ft (1.83m)
L
Clearance above paved sidewalk or paved
driveway located on public property
7 ft (2.13m)
7 ft (2.13m) t
M Clearance under veranda, porch, deck or balcony
*
12 in. (30 cm) TT
1
In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Code
2
In accordance with the current CAN/CGA-B149 Installation Codes
t Vent terminal shall not terminate directly above sidewalk or paved driveway located between 2 single family dwellings that serves both dwellings
TT 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
Table D: Vent/Air Inlet Termination Clearances