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Manual - Rinnai Condensing Water Heaters 27
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.
Clearance to opposite wall is 24 inches (60 cm) for Canada and US.
X
V
AIR SUPPLY INLET
VENT TERMINAL
AREA WHERE
TERMINAL IS NOT
PERMITTTED
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
combustion air inlet to any other appliance
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) 1 *
M Clearance under veranda, porch, deck, or balcony 12 inches (30 cm) 2 *