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Nondirect Vent (Single Pipe) Piping; Nondirect Vent Applications - Whirlpool WGFD293 Installation Instructions Manual

93% and 95% 2-stage variable speed gas furnace
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Nondirect vent installations require only a vent/flue pipe. The vent
pipe can be run horizontally with an exit through the side of the
building or run vertically with an exit through the roof of the
building. The vent can also be run through an existing unused
chimney; however, it must extend a minimum of 12" (30.5 cm)
above the top of the chimney. The space between the vent pipe
and the chimney must be closed with a weather-tight, corrosion-
resistant flashing. For details concerning connection of the vent/
flue pipe to the furnace, refer to "Vent Pipe Installation and
Combustion Air—Standard Furnace Connections" or "Vent Pipe
Installation and Combustion Air—Alternate Furnace
Connections" for specific details.
Refer to the following tables for applicable length, elbows and pipe diameter for construction of the vent/flue pipe systems of a
nondirect vent (single pipe) installation. In addition to the vent/flue pipe, a single 90º elbow should be secured to the combustion air
intake to prevent inadvertent blockage. The tee used in the vent/flue termination must be included when determining the number of
elbows in the piping system.
Upflow
Nondirect Vent (Single Pipe) Maximum Allowable Length of Vent/Flue Pipe—ft (m)
Unit Input (Btu)
Pipe—in. (cm)
45,000
2 or 2¹⁄₂ (5.12 or 6.4)
70,000
2 or 2¹⁄₂ (5.12 or 6.4)
3 (7.6)
90,000
3 (7.6)
115,000
3 (7.6)
Counterflow
Direct Vent (Dual Pipe) Maximum Allowable Length of Vent/Flue Pipe—ft (m)
Unit Input (Btu)
Pipe—in. (cm)
70,000
2 or 2¹⁄₂ (5.12 or 6.4)
3 (7.6)
90,000
2 or 2¹⁄₂ (5.12 or 6.4)
3 (7.6)
115,000
3 (7.6)
NOTES:
One 90º elbow should be secured to the combustion air
intake connection.
Minimum requirement for each vent/flue pipe is 5 ft (1.5 m)
and 1 elbow/tee.
Tee used in the vent/flue termination must be included when
determining the number of elbows in the piping system.

Nondirect Vent (Single Pipe) Piping

Refer to the following "Nondirect Vent (Single Pipe) Piping—Vent/
Flue Pipe Terminations" for specific details on termination
construction.
Although nondirect vent installations do not require a combustion
air intake pipe, a minimum of one 90° elbow should be attached
to the furnace's combustion air intake if an upright installation
uses the standard intake location, or a horizontal installation uses
the alternate air intake location. This elbow will guard against
inadvertent blockage of the air intake.

Nondirect Vent Applications

Number of Elbows
1
2
71 (21.6)
68 (20.7)
49 (14.9)
46 (14)
71 (21.6)
68 (20.7)
71 (21.6)
68 (20.7)
49 (14.9)
46 (14)
Number of Elbows
1
2
3
61 (18.6)
58 (17.7)
55 (16.8)
71 (21.6)
68 (20.7)
65 (19.8)
61 (18.6)
58 (17.7)
55 (16.8)
71 (21.6)
68 (20.7)
65 (19.8)
71 (21.6)
68 (20.7)
65 (19.8)
3
4
5
65 (19.8) 62 (18.9) 59 (18)
43 (13.1) 40 (12.2) 37 (11.3) 34 (10.4) 31 (9.5)
65 (19.8) 62 (18.9) 59 (18)
65 (19.8) 62 (18.9) 59 (18)
43 (13.1) 40 (12.2) 37 (11.3) 34 (10.4) 31 (9.5)
4
5
52 (15.8)
49 (14.9) 46 (14)
62 (18.9)
59 (18)
52 (15.8)
49 (14.9) 46 (14)
62 (18.9)
59 (18)
62 (18.9)
59 (18)
2¹⁄₂" or 3" (6.4 cm or 7.6 cm) diameter pipe can be used in
place of 2" (5.1 cm) diameter pipe.
Increased clearance configurations using two 45º long-sweep
elbows should be considered equivalent to one 90º elbow.
6
7
8
56 (17.1) 53 (16.2) 50 (15.2)
28 (8.5)
56 (17.1) 53 (16.2) 50 (15.2)
56 (17.1) 53 (16.2) 50 (15.2)
28 (8.5)
6
7
8
43 (13.1) 40 (12.2)
56 (17.1) 53 (16.2) 50 (15.2)
43 (13.1) 40 (12.2)
56 (17.1) 53 (16.2) 50 (15.2)
56 (17.1) 53 (16.2) 50 (15.2)
15

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