Whirlpool WGFD295 Instruction Manual download pdf (Page 15)

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.

Vent/Flue Pipe Terminations

■ The vent/flue pipe may terminate vertically, as through a roof,

or horizontally, as through an outside wall.

■ Vertical vent/flue pipe terminations should be as shown in

“Vertical Vent Termination (Single Pipe)” illustration. Refer to

“Termination Locations” in this section for details concerning

location restrictions.

■ The penetration of the vent through the roof must be sealed

tight with proper flashing such as is used with a plastic

plumbing vent.

■ Horizontal vent/flue pipe terminations should be as shown in

“Horizontal Vent Termination (Single Pipe)” illustration. Refer

to “Termination Locations” in this section for details

concerning location restrictions.

■ A 2³⁄₈" (6.1 cm) diameter wall penetration is required for 2"

(5.1 cm) diameter pipe.

■ A 3" (7.6 cm) diameter hole is required for a 2¹⁄₂" (6.4 cm)

pipe.

■ A 3¹⁄₂" (8.9 cm) diameter hole is required for 3" (7.6 cm)

diameter pipe.

■ To secure the pipe passing through the wall and prohibit

damage to the piping connections, a coupling should be

installed on either side of the wall and solvent cemented to a

length of pipe connecting the 2 couplings.

■ The length of pipe should be the wall thickness plus the

depth of the socket fittings to be installed on the inside and

outside of the wall.

■ The wall penetration should be sealed with silicone caulking

material.

■ In a basement installation, the vent/flue pipe can be run

between joist spaces.

NOTE: If the vent pipe must go below a joist and then up into

the last joist space to penetrate the header, two 45° elbows

should be used to reach the header rather than two 90°

elbows.

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)

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Whirlpool WGFD295 Instruction Manual Page 15

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