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4. MINIMUM CLEARANCES FROM VENT/AIR INLET TERMINATION
U.S. Installations1 Canadian Installations2
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 4 ft (1.2m) below or to side of
be opened opening; 1 foot (30 cm) above 3 ft (91 cm)
opening
C Clearance to permanently closed window * *
D Vertical clearance to ventilated soffit located above 5 ft (1.5m) *
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 6 ft (1.83m) *
H Clearance to each side of center line * 3 ft (91 cm) within a height
extended above meter/regulator assembly 15 ft above the meter/ regulator
assembly
I Clearance to service regulator vent outlet * 6 ft (1.83m)
J Clearance to non-mechanical air supply inlet to 4 ft (1.2m) below or to 3 ft (91 cm)
building or the combustion air inlet to any other side of opening; 1 ft
appliance (30 cm) above opening
K Clearance to mechanical air supply inlet 3 ft (91 cm) above if within 6 ft (1.83m)
10 ft (3m) horizontally
L Clearance above paved sidewalk or paved driveway 7 ft (2.13m) 7 ft (2.13m) t
located on public property
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
Fig. 20
V = vent terminal X = air supply inlet \\\ = area where terminal is not permitted
Tab. 6