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Provide maximum back pressure, based on the maximum

rated vent length shown in the Installation Instructions

included with dryer. Maximum Allowable Back Pressure chart

lists maximum rated vent length and back pressure.

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The minimum duct air velocity during normal operating

conditions should be at least 1,200 FPM (feet per minute) to

keep lint moving through the vent. (In a 4" (102 mm) diameter

pipe, this requires at least 105 CFM of air flow.)

Measuring and Verifying Actual System Back Pressure

Back pressure should be measured with an empty dryer, a clean

lint screen and with the dryer operating in the Air Only cycle

(no heat). Use an inclined manometer, such as Dwyer model

102 (0"-2" [0 mm - 51 mm] range) or Dwyer model 172

(0"-1" [0 mm - 25 mm] range) to measure the Back Pressure.

See the following illustration.

A. Dryer - empty and running on Air Only cycle

B. 12" (305 mm) min. of straight pipe - measure

back pressure from the center

C. To vent system

D. Location on back pressure measurement

E. Inclined manometer

Maximum Allowable Back Pressure for Dryer

Maximum Rated Vent

Length without 90° Elbows

(determined from product

literature)

36-37 ft

64 ft

100 ft

120 ft

130 ft

Single Dryer Venting Systems

Single dryer venting systems are defined as systems that have

only one dryer unit attached to a residential-type 4" (102 mm)

diameter rigid metal vent system. For single dryer venting

systems, see the Installation Instructions for the specific dryer

model being used or considered to determine the allowable length

and number of elbows for the venting system.

Maximum Allowable

Back pressure at connection

to dryer (no clothes loaded

and clean lint screen)

0.40" Water Column

0.60" Water Column

0.80" Water Column

1.00" Water Column

1.10" Water Column

Additional Elbows

In cases in which the Installation Instructions do not address the

vent length for the specific number of elbows required for a

particular application, the following calculations may be used.

(The total vent system length includes all straight and curved

portions of the vent system.):

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For 90° elbows, reduce the allowable vent system length by

10 ft (3.05 m).

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For 45° elbows, reduce the allowable vent system length by

6 ft (1.83 m).

For example, if the Installation Instructions state that a dryer is

allowed 40 ft (12.2 m) of total vent length with two 90° bends, and

the installation requires three 90° bends, the total allowable vent

length would be reduced by 10 ft (3.0 m) (from 40 ft [12.2 m] to

30 ft [9.1 m]).

Dryer Airflow

The airflow of a dryer depends on the design of the exhaust vent.

Each dryer model has a maximum rated vent length, shown in the

product literature that is supplied with each model, or on the

Whirlpool.com website. The exhaust airflow of any Whirlpool

produced dryer at the maximum rated vent length is at least

105 CFM. The maximum airflow is 230 CFM. This includes

standard vent and long vent dryer models.

Codes Agency Approvals

All Whirlpool electric dryer models, including "long vent dryers,"

Turbo Vent™ dryers and combo washer/dryer units that are sold

in the United States and Canada are UL listed (reference UL 2158

standard), and all Whirlpool gas dryer models are CSA listed

(reference ANSI Z21.5.1 standard). These standards require

testing at the maximum-rated exhaust vent conditions that are

published in the product literature for each individual model. The

designation for the UL or CSA listing can be found on or adjacent

to the serial label on the product.

Dryer Closet Installations

Closets used for dryer installation must provide multiple openings

to allow air to flow through the dryer and around the dryer to

dissipate heat. Any dryer enclosure or room that does not have an

inlet and outlet for an operating forced air HVAC system is

considered a closet, and requires room venting. The room venting

can be installed into the walls of the dryer enclosure, as well as

the door, provided it will not be blocked after the dryer is installed.

Refer to the product literature for minimum clearances between

the product and the enclosure surfaces. Refer to ANSI Z21.5.1

section 2.14.1.

Recommended room venting and spacing

for non-stacked installations

A. Side view - closet or confined area

B. Closet door with vents

*Required spacing

Installation spacing for recessed area or closet

The dimensions shown are for the minimum spacing allowed.

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Additional spacing should be considered for ease of

installation and servicing.

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Additional clearances might be required for wall, door, and

floor moldings.

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Additional spacing of 1" (25 mm) on all sides of the dryer is

recommended to reduce noise transfer.