Reznor VR Unit Installation Manual - Manual (Page 28)

Form I-VR, P/N 205202 R13, Page 27
Products of combustion can cause discoloration of some building finishes and
deterioration of masonry materials. Applying a clear silicone sealant that is
normally used to protect concrete driveways can protect masonry materials. If
discoloration is an esthetic problem, relocate the vent or install a vertical vent.
Wall
18”
(457mm)
minimum
18”
(457mm)
minimum
Fresh air intake cap
9” (229mm) maximum
Pitch flue pipe
down toward outlet
1/4” per foot for
condensate drainage.
Note position of
vent cap openings.
Roof or building overhang
3 ft (.9M)
minimum
6 ft (1.8M)
minimum
Parapet or adjoining building
Clearance thimble is required when
flue pipe extends through combustible
materials. Follow the requirements of the
thimble and/or
the vent pipe
manufacturer.
Note position of
vent cap openings.
6 ft (1.8M)
minimum
3 ft (.9M)
minimum
18”
(457mm)
minimum
Fresh air intake cap
9” (229mm) maximum
6” (152mm) minimum
Pitch flue pipe
down toward outlet
1/4” per foot for
condensate drainage.
Roof or building overhang
Parapet or adjoining building
Follow the
instructions in
the Addendum,
page 45, to join
double-wall and
single-wall pipe
and to attach a
vent cap to
double-wall pipe.
18”
(457mm)
minimum
Wall
Clearance thimble is
required when flue pipe
extends through combus-
tible materials. Follow the
requirements of the
thimble and/or
vent pipe
manufacturer.
FIGURE 26B - Horizontal Vent Terminal/Air Intake Arrangements
(drawings are not proportional; read
all information)
SINGLE WALL - Single-wall vent run;
single-wall terminal end; and single-wall
fresh air intake
DOUBLE WALL - Single-wall vent run;
double-wall terminal end; and single wall
fresh air intake
Wall
Pitch flue pipe
down toward outlet
1/4” per foot for
condensate drainage.
Note position of
vent cap openings.
18”
(457mm)
minimum
6 ft (1.8M)
minimum
3 ft (.9M)
minimum
Roof or building overhang
Parapet or adjoining building
Follow the
instructions in
the Addendum,
page 45, to join
double-wall and
single-wall pipe
and to attach a
vent cap to
double-wall pipe.
6” (152mm
)
minimum
Clearance thimble is
required when flue pipe
extends through com-
bustible materials.
Follow the requirements
of the thimble and/or
vent pipe manufacturer.
Wall
18”
(457mm)
minimum
Pitch flue pipe
down toward outlet
1/4” per foot for
condensate drainage.
Note position of
vent cap openings.
6 ft (1.8M)
minimum
Parapet or adjoining building
Roof or building overhang
3 ft (.9M)
minimum
Clearance thimble is required when
flue pipe extends through combustible
materials. Follow the requirements of
the thimble
and/or the
vent pipe
manu-
facturer.
FIGURE 26A - Horizontal Vent Terminal Arrangements
(drawings are not proportional; read all information)
SINGLE WALL - Single wall vent run and
single wall terminal end
DOUBLE WALL - Single wall vent run and
double wall terminal end
Horizontal Vent
Clearance Table
Structure
Minimum Clearances for Vent Termination
Location (all directions unless specified)
Forced air inlet within 10 ft (3.1m) 3 ft (0.9M) above*
Combustion air inlet of another appliance 6 ft (1.8M)
Door, window or gravity air inlet (any building
opening)
4 ft (1.2M) horizontally; 4 ft (1.2M) below;
1 ft (305mm) above
Electric meter, gas meter **, and relief
equipment
U.S. - 4 ft (1.2M) horizontally; Canada - 6 ft
(1.8M horizontally)
Gas regulator ** U.S. - 3 ft (0.9M); Canada - 6 ft (1.8M)
Adjoining building or parapet 6 ft (1.8M)
Adjacent public walkways 7 ft (2.1M) above
Grade (ground level) 1 ft (305mm) above
*This heater is approved for installation as illustrated in FIGURE 26B.
**Do not terminate the vent directly above a gas meter or service regulator.
The vent must be at least 6” (152mm) higher than anticipated snow depth.