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VENT TERMINAL CLEARANCES
Vent Terminal
Air Supply Inlet
Area where terminal is not permitted
REFERENCE LETTER TO DRAWING CANADIAN INSTALLATIONS U.S. INSTALLATIONS
A = Clearance above grade, veranda, 12 Inches (30 cm) 12 Inches (30 cm)
porch, deck, or balcony
B = Clearance to window or door that 12 Inches (30 cm) 9 Inches (23 cm)
may be opened
C = Clearance to permanently closed 12 Inches (30 cm) 9 Inches (23 cm)
window
D = Vertical clearance to ventilated soffit 18 Inches (46 cm) 18 Inches (46 cm)
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 18 Inches (46 cm) 18 Inches (46 cm)
F = Clearance to outside corner 12 Inches (30 cm) 12 Inches (30 cm)
G = Clearance to inside corner 12 Inches (30 cm) 12 Inches (30 cm)
H = Clearance to each side of center line 3 Feet (91 cm) within a height Clearance in accordance with
extended above meter/regulator 15 Feet (4.5m) above the meter/ local installation codes and the
assembly regulator assembly requirements of the gas supplier
I = Clearance to service regulator 3 Feet (91 cm) Clearance in accordance with
vent outlet local installation codes and the
requirements of the gas supplier
J = Clearance to nonmechanical air supply 12 Inches (30 cm) 12 Inches (30 cm)
inlet to building or the combustion
air inlet to any other appliance
K = Clearance to a mechanical air supply 6 Feet (1.83 m) 3 Feet (91 cm) above if within
inlet 10 Feet (3 m) horizontally
L = Clearance above paved sidewalk or 7 Feet (2.13m) A vent shall not Clearance in accordance with
paved driveway located on public terminate directly above a sidewalk or local installation codes and the
property paved driveway that is located between requirements of the gas supplier
two single family dwellings and
serves both dwellings
M = Clearance under veranda, porch, 12 Inches (30 cm) permitted only if Clearance in accordance with
deck, or balcony veranda, porch, deck, or balcony is local installation codes and the
fully open on a minimum of two sides requirements of the gas supplier
In accordance with the current CSA-B149.1 Natural Gas and Propane Installation Code
In aaccordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code
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