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Technical Info

WARNING - Fire/Health Hazard

  • Do Not use non-metal flexible duct.
  • Do Not use metal duct smaller than four inches in diameter.
  • Do Not use exhaust hoods with magnetic latches.
  • Check that exhaust system is not longer than specified. Exhaust systems longer than specified will:
    • Accumulate lint;
    • Shorten the life of the dryer;
    • Reduce performance, resulting in longer drying times and increased energy usage. Failure to follow specifications may result in a fire.
  • Do Not exhaust dryer into a chimney, furnace cold air duct, attic or crawl space, or any other duct used for venting.
  • Clean the exhaust system at least every other year, or more often if needed.
  • Do Not install flexible duct in enclosed walls, ceilings or floors. Accumulated lint could result in moisture damage.
  • Exhaust the dryer outside to prevent exposure to substances in gas fuels and combustion which may be harmful to your health. The moisture and lint indoors may cause:
    • FIRE HAZARD from lint collected in dryer;
    • Moisture damage to woodwork, furniture, paint, wallpaper, carpet, etc.;
    • House cleaning problems and possible health problems. Failure to follow these instructions could result in fire damage or personal injury.

Use duct tape to seal all joints.

Four-inch, rigid, metal pipe is preferred. Plan installation to use the fewest number of elbows and turns.

Metal flexible duct must be fully extended and supported when the dryer is in its final position. DO NOT KINK OR CRUSH THE DUCT. The metal flexible duct must be completely open to allow adequate exhaust air to flow. Allow as much room as possible when using elbows or making turns. Bend duct gradually to avoid kinking. Remove excess flexible duct to avoid sagging and kinking that may result in reduced air flow.
Exhaust outlet is located at the center of the bottom dryer back.

The exhaust duct can be routed up, down, left, right, behind the dryer or straight out the back of the dryer. Detailed space requirements can be found in the "Recessed area and closet installation instructions".

Maximum length of exhaust system depends upon the type of duct used, number of elbows and type of exhaust hood. The maximum length for both rigid and flexible duct is shown in Figure #1.

Service check: The back pressure in any exhaust system must not exceed 0.6 inches of water column measured with an inclined manometer at the point that the exhaust duct connects to the dryer.

Exhausting the dryer outside is recommended. A closet installation must be exhausted outside. Recessed installation that is not exhausted outside must use Exhaust Deflector Part No. 3391278 (electric dryer only) available from your dealer.

If dryer is installed in a confined area, such as a bedroom, bathroom or closet, it must be exhausted to the outside and provision made for enough air for combustion and ventilation. (Check governing codes and ordinances.) See "Recessed area and closet installation instructions".

An exhaust hood should cap the exhaust duct to prevent exhausted air from returning into the dryer. The outlet of the hood must be at least 12 inches from the ground or anything else that may be in the path of the exhaust.

Four-inch outlet hood is preferred. However, a 2-1/2-inch outlet exhaust hood may be used. A 2-1/2-inch outlet creates greater back pressure than other hood types.

A main exhaust duct can be used for exhausting a group of dryers. Main exhaust duct should be sized to remove 200 CFM of air per dryer. Large-capacity lint screens of proper design may be used in the main exhaust duct if checked and cleaned frequently. The room where the dryers are located should have make-up air equal to or greater than the CFM of all the dryers in the room. (See Figure #2.)

Back-draft damper kits (Part No. 3391910) are available from your Whirlpool dealer and should be installed in each dryer's exhaust duct to prevent exhausted air from returning into the dryers and to keep the exhaust in balance within the main exhaust duct. Unobstructed air openings are required.

Each exhaust duct should enter the main duct at an angle pointing in the direction of the air flow. Ducts entering from the opposite side should be staggered to reduce the exhausted air from interfering with the other ducts. (Figure #2.)

The maximum angle of each duct entering the main duct should be no more than 30 degrees. (Figure #2.)

Figure 1
Figure 2

CAUTION - Product Damage
Keep air openings free of dry-cleaning fluid fumes.

Fumes create acids which, when drawn through the dryer heating units, can damage dryers and loads being dried.

A clean-out cover should be located on the main exhaust duct for periodically cleaning the exhaust system.

An exhaust hood should cap the outside end of the main duct to prevent exhausted air from returning to the dryers. If an exhaust hood cannot be used, the outside end of the main duct should have a sweep elbow directed downward. If the main duct travels vertically through the roof, rather than through the wall, install 180 degree sweep elbow on the end of duct at least two feet above the highest part of the building. The opening wall or roof shall have a diameter 1/2" larger than the exhaust duct diameter. The exhaust duct should be centered in the opening. (See Figure #3.)

Do not install screening or cap over end of duct.

Figure 3
Typical Exhaust Installations

It is recommended that a metal elbow and at least two feet of metal duct must be used at the outlet of the dryer. This reduces the possibility of lint blocking the exhaust system and creating a fire hazard. Metal duct will not crush if and when dryer is moved for servicing. Flexible duct will crush. (See Figure #4.)

Recessed Area and Closet Installation Instructions

The dryer may be installed in a recessed area or closet. Detailed space requirements for recessed area and closet installations can be found on the label on the back panel of the dryer.
Figure 4

WARNING - Fire/Health Hazard

* Exhaust the dryer to the outside to prevent exposure to substances in the gas fuels and combustion by-products which may be harmful to your health. Failure to do so may result in a fire or health hazard.

The installation spacing is in inches and is minimum allowable. Additional spacing should be considered for ease of installation, servicing and compliance with local codes and ordinances. If closet door is installed, the minimum unobstructed air openings in top and bottom is required. Louvered doors with equivalent air openings are acceptable. (See Figure #5.)

Companion appliance spacing should be considered.

FOR CLOSET INSTALLATIONS, TO PREVENT LARGE AMOUNTS OF LINT AND MOISTURE FROM ACCUMULATING, TO MAINTAIN DRYING EFFICIENCY AND TO PREVENT EXPOSURE TO POSSIBLE HEALTH HAZARDS, THE DRYER MUST BE EXHAUSTED OUTDOORS.

Do not install screening or cap over end of duct.


Typical Exhaust Installations

It is recommended that a metal elbow and at least two feet of metal duct must be used at the outlet of the dryer. This reduces the possibility of lint blocking the exhaust system and creating a fire hazard. Metal duct will not crush if and when dryer is moved for servicing. Flexible duct will crush. (See Figure #4.)

Figure 5
Figure 6
Recessed Area and Closet Installation Instructions

The dryer may be installed in a recessed area or closet. Detailed space requirements for recessed area and closet installations can be found on the label on the back panel of the dryer.

Recessed non-exhausted installation must use only the rear exhaust position, and Exhaust Deflector Kit, Part No. 3391278, is required.

Shelf or cabinet is not permitted above dryer when non-exhausted. No other fuel-burning appliance may be installed in the same closet.

*Additional clearances for wall, door and floor moldings may be required or if external exhaust elbow is used.

**Opening is minimum for closet door. Louvered door with equivalent air opening is acceptable.



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