Whirlpool WFCU Installation Instructions Manual page 16

Inlet Air Assembly—45,000 & 67,000 Btu/h Furnaces
A
B
C
A. Straight inlet pipe
B. 22.5° elbows
Nondirect Vent Installation—Counterflow Models
Refer to appropriate tables for proper pipe size, vent length
and the number of elbows allowed.
Refer to "Materials" in "Plan Vent System" for the proper
venting material.
An inlet air restrictor plate found in the plastic bag containing
these Installation Instructions and the Use and Care Guide
must be installed in all nondirect vent installations.
Nondirect Vent—Counterflow (Horizontal Venting)
A
I
H
G
A. Inlet coupler
¹⁄₄
B. Run pitch = " (6.4 mm) per foot minimum
C. Flue pipe screen (inside flue pipe)
D. 6" (15.2 cm)
E. 12" (30.5 cm) minimum clearance. Adjust
height to expected snow level based on
local conditions.
16
C. Burner box
B
D
E
F. Inlet air restrictor plate
(inside intake pipe or
elbow)
G. Condensate collar
H. Flue pipe
I. PVC collars
NOTE: The vent for this appliance shall not terminate over public
walkways, or near soffit vents or crawl space vents or other areas
where condensate or vapor could create a nuisance or hazard or
cause property damage, or where condensate vapor could cause
damage or could be detrimental to the operation of regulators,
relief valves, or other equipment.
See "Inlet Air Restrictor Plate" in "Venting Requirements."
Attach a 90° elbow (not supplied) to the inlet coupler and
install the inlet air restrictor plate inside the elbow.
The flue pipe screen, designed to keep objects out of the flue
pipe (see "Flue Pipe Screen" in "Venting Requirements"),
should be installed at the termination of the flue pipe.
Nondirect Vent—Counterflow (Vertical Venting)
C
F
I
H
G
A. 24" (61 cm) minimum to roof or 12" (30.5 cm)
minimum clearance. Adjust height to expected
snow level based on local conditions.
B. Flue pipe screen inside flue pipe)
C. Storm collar
D. Flashing
E. Inlet air restrictor plate (inside intake pipe or
elbow)
B
C
A
D
J
E
F
F. Air intake pipe
G. Condensate collar
H. PVC collars
I. Flue pipe
J. Run pitch =
(6.4 mm) per foot
minimum
¹⁄₄
"