10
Commercial Hybrid System
INSIDE
CORNER DETAIL
FIXED
CLOSED
OPERABLE
FIXED
CLOSED
OPERABLE
B
B
B
A
J
B
M
C
F
B
B
E
D
L
G
A
H
K
I
[1] A vent shall not terminate directly above a sidewalk or paved driveway
that is located between two single family dwellings and serves both
dwellings.
[2] 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
, clearances are in
accordance with local installation codes and the requirements of the gas
supplier.
Clearance to opposite wall is 24 inches (60 cm).
X
V
AIR SUPPLY INLET
VENT TERMINAL
AREA WHERE TERMINAL
IS NOT PERMITTTED
A vent termination must be installed to bring in combustion air and expel exhaust to the outside.
SNOW
TERMINATION
Clearance in
Ref. A also
applies to
anticipated
snow line
Ref
Description
Canadian Installations
US Installations
A
Clearance above grade, veranda, porch, deck, or balcony
12 inches (30 cm)
12 inches (30 cm)
B
Clearance to window or door that may be opened
36 inches (91 cm)
12 inches (30 cm)
C
Clearance to permanently closed window
*
*
D
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
*
*
E
Clearance to unventilated soffit
*
*
F
Clearance to outside corner
*
*
G
Clearance to inside corner
*
*
H
Clearance to each side of center line extended above meter/regulator
assembly
3 feet (91 cm) within a height 15
feet (4.5 m) above the meter/
regulator assembly
*
I
Clearance to service regulator vent outlet
36 inches (91 cm)
*
J
Clearance to nonmechanical air supply inlet to building or the
36 inches (91 cm)
12 inches (30 cm)
K
Clearance to a mechanical air supply inlet
6 feet (1.83 m)
3 feet (91 cm) above if within 10
feet (3 m) horizontally
L
Clearance above paved sidewalk or paved driveway located on public
property
7 feet (2.13 m)
*
M
Clearance under veranda, porch, deck, or balcony
12 inches (30 cm)
*
Direct Vent Terminal Clearances
