CLOSED
(_ AIR SUPPLY INLET
E_] VENT TERMINAL
AREA WHERE
TERMINAL IS NOT
PERMITTTED
d)
©
Ref
A
B
C
D
US Installations
12 inches (30 cm)
12 inches (30 cm)
E *
F Clearance *
G Clearance *
H Clearance *
assembly
I Clearance
J
Description
Clearance above grade, veranda, porch, deck, or balcony
Clearance to window or door that may be opened
Clearance to permanently closed window
Vertical clearance to ventilated soffit, located above the terminal within a
horizontal distance of 2 feet (61 cm) from the center line of the terminal
Clearance to unventilated soffit
to outside corner
to inside corner
to each side of center line extended above meter/regulator
to service regulator vent outlet
Clearance to nonmechanical air supply inlet to building or the combustion air
inlet to any other appliance
Clearance to a mechanical air supply inlet
K
L Clearance above paved sidewalk or paved driveway located on public property O
M Clearance under veranda, porch, deck, or balcony Q
12 inches (30 cm)
3 feet (91 cm) above if within
10 feet (3 m) horizontally
A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves
both dwellings.
Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearances are in accordance with local installation codes and the
requirements of the gas supplier.
18 305 & 505 Outdoor Manual
