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305, 505, 705 Indoor Manual 25
Flue Terminal Clearances (ANS Z21.10.3 ● CSA 4.3)
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 or CSA B149.1, clearances are in accordance with local installation codes and the
requirements of the gas supplier.
X
V
AIR SUPPLY INLET
VENT TERMINAL
AREA WHERE
TERMINAL IS NOT
PERMITTTED
Ref
Description US Installations
A Clearance above grade, veranda, porch, deck, or balcony 12 inches (30 cm)
B Clearance to window or door that may be opened 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
*
I Clearance to service regulator vent outlet *
J
Clearance to nonmechanical air supply inlet to building or the
combustion air inlet to any other appliance
12 inches (30 cm)
K Clearance to a mechanical air supply inlet
3 feet (91 cm) above if within
10 feet (3 m) horizontally
L
Clearance above paved sidewalk or paved driveway located on
public property
*
M Clearance under veranda, porch, deck, or balcony *