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Combustion Air Pipe-Direct Vent Installations; Combustion Air Pipe-Nondirect Vent Installations - Whirlpool WGFD293 Installation Instructions Manual

93% and 95% 2-stage variable speed gas furnace
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Vent Termination Clearances
A
J
E
I
H
E
G
F
A. Nondirect vent and direct vent
vent/flue terminations
B. Nondirect vent—vent/flue
terminations
C. No terminations above walkway
D. 48" (121.9 cm minimum)
E. 12" (30.5 cm) minimum
Increased Clearance Configuration
A. Vent pipe
B. 45º long-sweep elbows
NOTES:
Do not use other commercially available "no hub connectors"
due to possible material conflicts.
The vent/flue pipe can also be secured using a PVC or ABS
elbow or coupling using the appropriate glue (see "Materials
and Joining Methods").
For nondirect vent installations, a minimum of one 90° elbow
should be installed on the combustion air intake coupling to
guard against inadvertent blockage.
Combustion Air Pipe—Direct Vent Installations
On upflow units, secure the combustion air intake pipe directly to
the air intake coupling. On counterflow units secure the
combustion air intake pipe to the air intake coupling using the
rubber coupling and worm gear hose clamps provided with the
unit. The counterflow rubber coupling allows service removal of
air intake piping internal to the furnace blower compartment.
12
B
C
D
D
E
E
B
F. Direct vent—vent/flue
termination
G. Forced air inlet
H. Grade or highest anticipated
snow level
I. 3" (7.6 cm) minimum
J. Less than 10 ft (3 m)
A
B
NOTE: Because of probable material conflicts, do not use other
commercially available "no hub connectors." The combustion air
intake pipe can also be secured directly to the counterflow unit
air intake pipe coupling.
Combustion Air Pipe—Nondirect Vent Installations
A minimum of one 90° elbow should be installed on the
combustion air intake coupling to guard against inadvertent
blockage.
Standard Connection—Upflow
B
A
A. 90º PVC elbow (nondirect vent only)
B. Combustion air pipe (direct vent
only)
Standard Connection—Counterflow
B
A
A. 90º PVC elbow (nondirect vent
only)
B. Combustion air pipe (direct vent
only)
D
C
C. Rubber coupling with worm
gear hose clamps
D. Vent/flue pipe
D
C
C. Rubber couplings with worm
gear hose clamps
D. Vent/flue pipe

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