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Length of dryer exhaust

I have a 29'' Whirlpool electric dryer. Venting to the outside will exceed recommended length with elbows. Total straight length is 30' with a total of 6 elbows. Can I use 5'' dia in lieu of 4'' to reduce pressure drop?

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You can try but alot of elbows.it should work but it may start blowing your thermal fuse.they sell vent kits that you just add water to the kit with vent inside.good luck.

Posted on Mar 11, 2009

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What could cause dead animal odor from my whirlpool cabrio dryer?


check in the dryer's exhaust hose right behind it, there could be a dead animal in it. I had a squirrel in it once. true story :S

Sep 02, 2015 | Whirlpool Dryers

Tip

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.

on Dec 04, 2009 | Dryers

Tip

Dryer Ducting Installation Tips


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.

on Feb 10, 2008 | Whirlpool GEW9250 Electric Dryer

1 Answer

Powers on, then immediately shuts off. More detailed in comments below This is too aggravating!!!!!!! Characters characters


Hello Kathy: All clothes dryers work on the same basic principle...
1.) Air Flow
2.) Heat
3.) Rotation

Your problem may lie in your duct work configuration and how the exhaust gases are vented; the mere fact that you had blockage could have overheated the dryer's high limit thermostat and/or the thermal fuse...BUT, before I go any further...I need to talk to you about safety!

Gas dryers give off combustion gases that are toxic and DEADLY; DO NOT VENT YOUR DRYER UNDER YOUR HOUSE SLAB to the outside! Especially that you report that it gets WET inside that underground slab- it's against NFPA fire codes (municipal and state building codes, as well) to do that. If that slab ever collapses partially or fully, you'll have no way of knowing it and the toxic gases will back-up into your house.

The safer venting method should be done with 4 inch solid wall vent pipe; and should be vented directly outside. Maximum duct work (straight run of ducting without the use of any elbows) for your model gas dryer, is 65 feet.

If you are using 1- 90 degree, the total length reduces to 55 feet, including the elbow in that measurement

The use of 2- 90 degree elbows, 47 feet; for 3- 90 degree elbows, 36 feet, and for 4- 90 degree elbows, 28 feet- maximum length.

These are per your manufacturer's installation specifications.

Although you should not use more than 4- 90 degree elbows in your configuration, in the event you do, you would deduct 6 feet for each additional elbow used. You want to make sure that you can visibly see the vent pipe (to visually inspect it for defects or for ease of access to clean and service)- and never keep flammables of sorts near the vent pipe due to the heat that they radiate.

I choose solid vent pipe over foil or plastic (in my home, rental properties, and when I do installs) because lint does have a tendency to burn inside the duct work...which could lead to perforation and/or fire. Plus many manufacturers recommend solid vent pipe over other types; and I do not recommend using screws to connect solid vent pipe together with, since lint can catch on the exposed screw that protrudes into the duct. Use a combination of, heat rated duct tape and dryer vent clamps.

Some installers or readers of this will think that this is excessive, costly, and not necessary; through my life's experiences, I have seen unfortunate yet avoidable tragedies. (Don't forget to check & clean your dryer ducts at least once-a-year!- I do mine at the start and end of DST- the same day we change the clocks and the batteries on our smoke and carbon monoxide detector alarms.)

Now, concerning the rest of the troubleshooting process, are you getting any trouble code errors on the electronic panel? If so, what are they?

You have several choices, you can disconnect and remove the high limit thermostat and thermal fuse and check them for continuity or call tech support using their smart diagnosis procedures as outlined on page 35 of you owner's manual. Or you can disconnect the dryer at it's power source (outlet or circuit breaker) and wait a half hour; see if the electronic computer panel resets. Then try running the dryer.

Please let me know how you made out or if you need more help.

Mar 15, 2015 | LG DLE2240W Dryer

1 Answer

Keep getting warning "check exhaust" on a new gas dryer. All exhaust is clear. What's going on?


The CHECK VENT duct blockage sensing system detects and alerts you to blockages in the duct work that reduce exhaust flow from the dryer. This light does not indicate any problems with your dryer. If this light blinks, it indicates that your home's exhaust system/duct work has a serious restriction

Every time the dryer is turned on, the CHECK FILTER LIGHT WILL BLINK, as a reminder to make sure the filter is clean. Always make sure the lint filter is clean before starting a new load; a clogged lint filter will increase drying times.

The Kenmore Elite dryer has a sensor that detects poor exhaust venting, and when it does, a light flashes on the control panel. This warning light does not include a mechanism to stop gas flow, but if it is allowed to flash for an extended period, poor venting may cause the dryer to overheat. As a result, a fuse might blow and disable the gas valve or ignitor. You can prevent this by diagnosing the reason for the flashing indicator light as soon as possible.

In many cases, LINT has built up somewhere in the exhaust pipes.

Check under the lint filter. Pull it out,look inside the slot it fits in, and clear all lint from this area.

Is it possible you have used the WRONG VENT MATERIAL?
Check your vent to make sure it is 4 inch rigid or semi-rigid metal ducting. If your venting is plastic or flexible foil, replace it before using the dryer.

Check your vent hood outside. You may have a restricted or damaged vent hood. It must be clean and free of lint buildup. Check the damper and make sure it opens fully and easily and is free of lint.

I know you said you have no elbows, but I have posted the pipe run lengths with and without elbows. Keep in mind this is with 4 inch rigid or semi rigid metal ducting.

Measure the length of your exhaust system and count the elbows. Use the chart below to see if your duct is too long. If it is too long, have the duct routed to another location that is within the venting guidelines.

0~90 degree elbows=65 ft of 4 inch rigid metal duct.
1~90 degree elbow=55 ft of 4 inch rigid metal duct.
2~90 degree elbows=47 ft """"""""
3~90 degree elbows=36 ft """"""""
4~90 degree elbows=28 ft """"""""

You should always use duct tape or metal tape on all joints, NEVER USE SCREWS, as screws capture lint inside the pipe.

One more note. Lots of people overlook the fact that fabric softeners can build up on the lint filter over time. This buildup can restrict the airflow through the filter reducing dryer efficiency and lengthening drying times. After removing lint, if the filter looks dark or dirty when held up to the light, follow these steps to clean:

Use hot soapy water and a stiff brush to clean
the filter.
Make sure the filter is completely dry before
reinstalling it and using the dryer.
NEVER operate the dryer with a wet lint filter.

Oct 29, 2014 | Kenmore Dryers

1 Answer

Can an electric Frigidaire dryer be changed to side venting by simply replacing the rear-venting pipe from the blower manifold with a 4 inch long piece and a 90 degree elbow? the kit they sell has just one...


Yes. Keep in mind though, the sharper the turn of the vent, the shorter the total vent length should be. If the turn is veri sharp, it can result in lint accumulation where it turns.

Good luck
Vladimir
First Choice Appliance

Sep 11, 2010 | Frigidaire Electric Dryer

1 Answer

What does it mean when my dryer flashes the letters "af"


Your dryer vent may be crushed or blocked. To resolve this issue:
,Check to see if the vent run from the dryer to the wall is crushed.
Confirm that the vent run from the dryer to the wall is free of lint and debris.
Confirm that the exterior vent exhaust hood is free of lint and debris.
Confirm that your vent system falls within the recommended run length and number of elbows for the type of vent you are using. Refer to the "Plan Vent
System" section of the Use and Care Guide for details.
Select a Timed Dry heated cycle, and restart the dryer.
If the message persists, have your entire home venting run cleaned.

Apr 04, 2010 | Kenmore 67082 Electric Dryer

1 Answer

We have tried 3 maytag and now one whirlpool electric dryers at our lake house...all new but they all take toooo long to dry what I think is a very reasonable load. We checked the outlet for power seems...


The problem is not the power cord, it maybe the length of the venting. Every elbow is equivalent to 8 more feet of pipe. Not sure which model you have. How long is the length of vent? Does it go right out the wall?

Jun 16, 2009 | Estate TEDS740JQ Electric Dryer

1 Answer

Not heating as hot


Hi thyme4sony


The first thing to look for is in the venting. most people think that HEAT is what drys your cloths, this is partly true but what most people dont realize is that you need airflow aswell.so having said that check the venting there must be a build up of lint in the line. the other this is the length of your venting , if there is a lot of 90 degree elbows that is gonna be a probelm to because every elbow adds 5 feet of hose.i hope this helped.
brent

Sep 16, 2008 | Whirlpool LER5636P Electric Dryer

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