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Rinnai Corporation EX17C / EX22C Manual 19
Flue Terminal Clearances
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.
Ref
Description Canadian Installations US Installations
A
Clearance above grade, veranda,
porch, deck, or balcony. (Take into
account the anticipated snow line)
12 inches (30 cm) 12 inches (30 cm)
B
Clearance to window or door that may
be opened
6 inches (15 cm) for
appliances < 10,000 BTUh;
12 inches (30 cm) for
appliances > 10,000 BTUh
and < 100,000 BTUh,
36 inches (91 cm) for
appliances > 100,000 BTUh
6 inches (15 cm) for
appliances < 10,000 BTUh;
9 inches (23 cm) for
appliances > 10,000 BTUh
and < 50,000 BTUh,
12 inches (30 cm) for
appliances > 50,000 BTUh
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 20 inches (50 cm) 20 inches (50 cm)
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
3 feet (91 cm) *
J
Clearance to nonmechanical air supply
inlet to building or the combustion air
inlet to any other appliance
6 inches (15 cm) for
appliances < 10,000 BTUh;
12 inches (30 cm) for
appliances > 10,000 BTUh
and < 100,000 BTUh,
36 inches (91 cm) for
appliances > 100,000 BTUh
6 inches (15 cm) for
appliances < 10,000 BTUh;
9 inches (23 cm) for
appliances > 10,000 BTUh
and < 50,000 BTUh,
12 inches (30 cm) for
appliances > 50,000 BTUh
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) to non-
flammables 2
24 inches (60 cm) to
flammables 2
12 inches (30 cm) to non-
flammables 2
24 inches (60 cm) to
flammables 2