Installation Sheet

18 Rinnai Corporation EX38C Manual
Flue Terminal Clearances
 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.
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
12 inches (30 cm) 9 inches (23 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 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
12 inches (30 cm) 9 inches (23 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) to non-
flammables 
24 inches (60 cm) to
flammables 
12 inches (30 cm) to non-
flammables 
24 inches (60 cm) to
flammables 