Rinnai RU80i Installation And Operation Manual page 7

Direct Vent Terminal Clearances (Indoor Units)
For indoor models, you must install a vent termination to bring in combustion air and expel exhaust.
TERMINATION
Clearance in
Ref. A also
applies to
anticipated
snow line
SNOW
D
E
B
L
Ref
A Clearance above grade, veranda, porch, deck, or balcony
B Clearance to window or door that may be opened
C Clearance to permanently closed window
Vertical clearance to ventilated soffit, located above the
D 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
Clearance to each side of center line extended above meter/
H
regulator assembly
I Clearance to service regulator vent outlet
Clearance to nonmechanical air supply inlet to building or the
J
combustion air inlet to any other appliance
K Clearance to a mechanical air supply inlet
Clearance above paved sidewalk or paved driveway located on
L
public property
M Clearance under veranda, porch, deck, or balcony
[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.
A
C
FIXED
CLOSED
OPERABLE
F
B
Description
KB Series Manual
INSIDE
CORNER DETAIL
G
B
FIXED
B
CLOSED
OPERABLE
B
J
B
A
Canadian Installations
12 inches (30 cm)
36 inches (91 cm)
*
*
*
*
*
3 feet (91 cm) within a height 15 feet
(4.5 m) above the meter/regulator
assembly
36 inches (91 cm)
36 inches (91 cm)
6 feet (1.83 m)
7 feet (2.13 m) 
12 inches (30 cm) 

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).
H
I
M
K
X
AIR SUPPLY INLET
V
VENT TERMINAL
AREA WHERE TERMINAL
IS NOT PERMITTTED
US Installations
12 inches (30 cm)
12 inches (30 cm)
*
*
*
*
*
*
*
12 inches (30 cm)
3 feet (91 cm) above if within 10
feet (3 m) horizontally
*
*
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