Whirlpool WGFD293 Instruction Manual download pdf (Page 15)

Nondirect Vent (Single Pipe) Piping

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 “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

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.

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.

■ 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.

Upflow

Nondirect Vent (Single Pipe) Maximum Allowable Length of Vent/Flue Pipe—ft (m)

Number of Elbows

Unit Input (Btu) Pipe—in. (cm) 1 2 3 4 5 6 7 8

45,000 2 or 2¹⁄₂ (5.12 or 6.4) 71 (21.6) 68 (20.7) 65 (19.8) 62 (18.9) 59 (18) 56 (17.1) 53 (16.2) 50 (15.2)

70,000 2 or 2¹⁄₂ (5.12 or 6.4) 49 (14.9) 46 (14) 43 (13.1) 40 (12.2) 37 (11.3) 34 (10.4) 31 (9.5) 28 (8.5)

3 (7.6) 71 (21.6) 68 (20.7) 65 (19.8) 62 (18.9) 59 (18) 56 (17.1) 53 (16.2) 50 (15.2)

90,000 3 (7.6) 71 (21.6) 68 (20.7) 65 (19.8) 62 (18.9) 59 (18) 56 (17.1) 53 (16.2) 50 (15.2)

115,000 3 (7.6) 49 (14.9) 46 (14) 43 (13.1) 40 (12.2) 37 (11.3) 34 (10.4) 31 (9.5) 28 (8.5)

Counterflow

Direct Vent (Dual Pipe) Maximum Allowable Length of Vent/Flue Pipe—ft (m)

Number of Elbows

Unit Input (Btu) Pipe—in. (cm) 1 2 3 4 5 6 7 8

70,000 2 or 2¹⁄₂ (5.12 or 6.4) 61 (18.6) 58 (17.7) 55 (16.8) 52 (15.8) 49 (14.9) 46 (14) 43 (13.1) 40 (12.2)

3 (7.6) 71 (21.6) 68 (20.7) 65 (19.8) 62 (18.9) 59 (18) 56 (17.1) 53 (16.2) 50 (15.2)

90,000 2 or 2¹⁄₂ (5.12 or 6.4) 61 (18.6) 58 (17.7) 55 (16.8) 52 (15.8) 49 (14.9) 46 (14) 43 (13.1) 40 (12.2)

3 (7.6) 71 (21.6) 68 (20.7) 65 (19.8) 62 (18.9) 59 (18) 56 (17.1) 53 (16.2) 50 (15.2)

115,000 3 (7.6) 71 (21.6) 68 (20.7) 65 (19.8) 62 (18.9) 59 (18) 56 (17.1) 53 (16.2) 50 (15.2)

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