Whirlpool 8535899 installation instructions Determine Vent Length, Vent Length Chart

■Periscope Installation (For use with dryer vent to wall vent mismatch):

Part Number 4396037 - 0 in. (0 cm) to 18 in. (45.72 cm) mismatch

Part Number 4396011 - 18 in. (45.72 cm) to 29 in. (73.66 cm) mismatch

Part Number 4396014 - 29 in. (73.66 cm) to 50 in. (127 cm) mismatch

Special provisions for mobile home installations

The exhaust vent must be securely fastened to a noncombustible portion of the mobile home structure and must not terminate beneath the mobile home. Terminate the exhaust vent outside.

Exhaust systems longer than specified will:

■Shorten the life of the dryer.

■Reduce performance, resulting in longer drying times and increased energy usage.

3.Determine the number of elbows you will need.

NOTE: Do not use vent runs longer than specified in the Vent Length Chart.

When using only one type of metal vent:

Use the following chart to help you determine your maximum vent length based on the number of 90° turns or elbows you will need and the type of vent (rigid and/or flexible metal) you will use.

Determine Vent Length

1.Select the route that will provide the straightest and most direct path outdoors. Plan the installation to use the fewest number of elbows and turns. When using elbows or making turns, allow as much room as possible. Bend vent gradually to avoid kinking. Avoid 90º turns.

2.Determine vent length.

The maximum length of the exhaust system depends upon:

■The type of vent (rigid metal or flexible metal).

■The number of elbows used.

■If a combination of rigid and flexible metal vent is used. Recommended hood styles are shown here.

2

1

4"

(10.2 cm)

4" (10.2 cm)

1.Louvered hood style

2.Box hood style

The angled hood style (shown following) is acceptable.

4" (10.2 cm)

2½"

(6.4 cm)

The same length of vent can be used with any of the 3 exhaust hoods shown.

Vent Length Chart

Number of 90º	Rigid metal vent	Flexible metal vent
turns or elbows
0	120 ft (36.6 m)	40 ft (12.2 m)
1	110 ft (33.5 m)	37 ft (11.3 m)
2	100 ft (30.5 m)	33 ft (10.1 m)
3	90 ft (27.4 m)	30 ft (9.1 m)
4	80 ft (24.4 m)	27 ft (8.2 m)
5	70 ft (21.3 m)	23 ft (7.0 m)

When using a combination of rigid and flexible metal vent:

Use the following charts to help you determine your maximum vent length based on the number of 90° turns or elbows you will need.

■Determine the number of elbows or turns you will need.

■Determine the length of the fully extended flexible metal vent you will use. Find the column that has the nearest number of feet to what you will be using.

■Match the number of turns or elbows with the length of the fully extended flexible metal vent you will use to find the maximum length of rigid metal vent you can use.

Vent Length Chart - 0 ft (0 m) to 10 ft (3.0 m)

No. of	Length of Flexible Metal Vent
turns or
elbows	0 ft	1-5 ft	6-10 ft
	(0 m)	(.3-1.5 m)	(1.8-3.0 m)
0	120 ft	105 ft	90 ft
	(36.6 m)	(32.0 m)	(27.4 m)
1	110 ft	95 ft	80 ft
	(33.5 m)	(29.0 m)	(24.4 m)	Length
2	100 ft	85 ft	70 ft	of
	(30.5 m)	(25.9 m)	(21.3 m)	Rigid
				metal
3	90 ft	75 ft	60 ft	vent
	(27.4 m)	(22.9 m)	(18.3 m)
4	80 ft	65 ft	50 ft
	(24.4 m)	(19.8 m)	(15.2 m)
5	70 ft	55 ft	40 ft
	(21.3 m)	(16.8 m)	(12.2 m)

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