Tip & How-To about Dryers

Dryer Ducting Installation Advice

Here's some useful guidance for installing dryer ducting. Improperly installed ducting can cause the following:

GAS DRYERS - Rapid burn cycling and improper drying results.
ELECTRIC DRYERS - Premature Heating Element failures.

IMPORTANT! NEVER terminate ducting in a chimney, under an enclosed crawl space or attic, and never common a dryer duct with a kitchen exhaust.

The total length of ducting and number of turns should be kept to a minimum. Semi-rigid metal type ducting is strongly recommended as it is more durable and resists collapsing.

If connecting sections of ducting, all joints should be tight to avoid leaks. The male end of each section must point AWAY from the dryer to prevent lint from accumulating at each junction. Ductwork should NOT be assembled with screws or fasteners that extend INTO the duct as this also will create points where lint will become snagged and accumulate. Wrap overlapping sections of ducting with duct tape.

A screen should NEVER be installed over the exhaust duct termination. The preferred termination is a dampered wall cap having a 4 inch opening. It must be installed a minimum of 12 inches above the ground.

Maximum Length of Metal Duct:

# of 90 degree elbows:

4" Semi-Rigid 4" Flexible
0 - 58 ft 28 ft
1 - 48 ft 23 ft
2 - 38 ft 19 ft
3 - 29 ft 17 ft
4 - 21 ft 15 ft

NOTE: It is recommended that you inspect your dryer ducting periodically to ensure you have no lint build up. Excessive lint can present a fire hazard.

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2 Answers

electrolux dryer won't heat

a gas dryer has a ignighter that may have burned out. a $40 part

May 12, 2014 | Electrolux Dryers

1 Answer


The most common cause of extra long dry cycles that I have found is RESTRICTED DRYER VENT DUCTING!!!!!!!!!
Make sure you thoroughly clean or replace the ducting connected to the dryer exhaust tube, if at all possible, DO NOT USE FLEXIBLE DRYER DUCTING, ESPECIALLY NOT WHITE VINYL FLEX DUCTING!!!!!!!
If you have to use flex, make sure it is as short of a run as possible, and no sagging, no crushed or restricted areas, and pull taught once you have made your run, to limit the ridges, thus reducing restrictions.
Refer to your installation manual for manufactures recommendations.
Have a great day !

Mar 16, 2010 | Dryers

1 Answer

My dryer takes much longer to dry loads now


You need to check the following things to sort out the issue you are facing with--

Improper sorting •Separate heavy items from lightweight items (generally, to dry a well-sorted washer load is a well-sorted dryer load).
Large loads of heavy fabrics •Large, heavy fabrics contain more moisture and take (like beach towels) longer to dry. Separate large, heavy fabrics into smaller loads to speed drying time.
Controls improperly set •Match control settings to the load you are drying.
Lint filter is full •Clean lint filter before every load.
Improper or obstructed ducting •Check installation instructions for proper ducting/venting.
•Make sure ducting is clean, free of kinks and unobstructed.
•Check to see if outside wall damper operates easily.
•Check the Installation Instructions to make sure the dryer venting is correct.
Blown fuses or tripped •Replace fuses or reset circuit breakers. Since most dryers circuit breaker use 2 fuses/breakers, make sure both are operating.
Overloading/combining loads •Do not put more than one washer load in the dryer at a time.
Underloading •If you are drying only one or two items, add a few items to ensure proper tumbling.

Thanks for using FixYa and do rate the solution as Fixya if found helpful.


Apr 03, 2009 | GE DVLR223 Dryers

2 Answers

whirlpool dryer: blows but will not heat

If your dryer runs, but does not heat, click on the following link for some detailed advice on how to diagnose and determine the cause.


Most dryer heat problems are associated with clogged, or improperly installed ducting. It's much easier to rule out the external causes before inspecting the dryer interior. I hope you find this information helpful. If you need further assistance, please post back and let me know.

May 26, 2008 | Whirlpool LER5636P Electric Dryer

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