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Dryer exhaust booster fan

I have approximately 20' of 4" metal exhaust pipe on a Kenmore 110.94832201 gas dryer. I would like to insert a duct booster fan to increase air flow and reduce drying time. Is this suggested and if so can you recommend a point in the dryer circuitry I can use to activate a control relay.

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Your dryer can run with up to a 25 foot venting system. what you need to figure is that every 90- degree elbow adds 2 foot to your vent length. but i would not add any type of vent booster as it will, over time, need to be cleaned out.
just do the best you can to keep the vent straight and dont use any soft flexible tubing. they have what is called semi-rigid flexible vent and would be the best if you have to make any bends.
the most important part of your vent is behind the dryer. what i do is pull the washer out and get behind it, then reach back and connect the dryer, that way your vent is as short as possible. if you can use metal elbows and remember to keep it straight and smooth.

Posted on Jan 06, 2009

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Hi , i've been a plumber for 15 years from experiance i can tell you please do not do that . it will work fine for a month then when bild up starts to flow thru the pipe the sparks from the motor will light that build up and start fire , i strongly suggest not to install one hope this could help. if you would like to reduce drying time just upgrade the size of the pipe to 6 ''.

Posted on Jan 06, 2009

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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

2 Answers

Where to find fuses. My dryer is not heating up.


Does your dryer have power? If yes, then check (1) the flow of air outside the house from your dryer tube and (2) your circuit breaker panel for each circuit in the house (I've not seen fuses/breakers built into dryers -- though that could change). Then check (3) your heating element, (4) thermostat, (5) high-temp thermal cutoff switch, and (6) for debris in the air flow path to / from from the centrifugal fan.
Here are 3 resources that helped me with my Kenmore Series 90 Dryer:
No Heat? - http://chris-doityourselfrepair.blogspot.com/2011/10/kenmore-90-series-model-110-clothes.html
Looking Inside My Dryer - http://chris-doityourselfrepair.blogspot.com/search/label/Disassembling%20Kenmore%20Dryer%2090%20Series
Exterior Exhaust Duct - http://chris-doityourselfrepair.blogspot.com/2013/08/cleaning-out-and-replacing-exhaust-duct.html

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1 Answer

Dryer vent duct


The vent pipe codes are based on the fact that the blower in a typical gas dryer can only 'push' a certain volume of air through a certain sized duct for a certain number of feet. Reduced volume of airflow means higher temperatures thus higher risk of fire.
First option ... is your dryer anywhere near a side wall, which would allow you to shorten the total length of duct required to reach the outside to something less than the 14 ft code limit ?
Second option ... upsize the standard 4" dryer exhaust duct to 6" to compensate for the 30ft length
Either way, in the absence of an external forced draft booster fan ( a.k.a. 'power vent' fan ) you should be using metal exhaust duct not plastic.

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1 Answer

What are the maximum number of joints a recommended in the dryer vent pipe for these electric Ge profile dryers.


Codes typically require that the dryer duct be no more than 25 feet long. It should be 2.5 feet shorter than 25 feet for every 45-degree bend and 5 feet shorter for every 90-degree bend. If the duct is more than 25 feet in length, the system requires a booster fan or a high-output dryer. Ducts should be smooth metal with a minimum diameter of 4". Flexible ducts shouldn't be used, since they collect more lint and can easily be crushed, impeding airflow and potentially starting lint fires. The ducts shouldn't have screws or connectors, which could collect lint, blocking the flow of combustion gases. Backdrafting can occur if the ducts are blocked, sending harmful carbon monoxide back into the home.

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1 Answer

My Kenmore Elite Dryer seems to be dryer a lot slower than it used to... it gets warm, spins and all, but the clothes seem as though are damp


  • Most of the time a dryer will work much less efficiently when the exhaust ducts and vent are full of lint. You should periodically dismantle the ducts enough to get a vacuum into every section of pipe, especially the elbows and outside vent Don't forget the dryer itself; vacuum the outlet thoroughly.
  • Be sure to duct tape (the REAL use for duct tape!) to seal the joints. Be sure to turn off the gas and unplug it before you begin, and be careful with the gas line if it is a gas dryer.
  • You will find it runs for less time, and dries better when you are through.

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2 Answers

Maytag performa elecric dryer blows thermal fuse after 20 loads


you need to clean out the dryer and the vent line,the air isn't moving like it should,there is a block some where and when it heats up hotter than it should it pops the thermal fuse,if you have a long run on the vent line blow it out with a leaf blower,go outside and make sure nothing is blocking the air flow,some outside vents have cages on them so animals can't climb into the vent line,good idea but now it's a lint catch,the air can't blow out and the thermal fuse pops or the dryer takes forever to dry clothes,then clean out the duct that the lint filter slides into and vac out the inside of dryer where the motor is,you shouldn't have any problems after that,clean it out at least once a year so this doesn't happen again and you won't have any dryer fires,hope this helps,good luck

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2 Answers

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Its most like to be the thermostat, temp sensor or the heating element is broken.

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because the duct still runs through the house there is not as much condensation as you would anticipate. apartment buildings run ducting hundreds of feet

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