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Old 08-19-2011, 08:26 PM   #1
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Dryer venting


I want to run a dryer vent from inside my celler wall, thru a cinder block wall, then accross 18 feet of surface of garage closed ceiling, thru another cinder block wall to the outside.

I just found out about a booster blower to use with the dryer.

The garage is heated all year. I don't expect much condensation.

Am i thinking straight. If i use 4 in pipe galvanized pipe will i be ok.

It's an electric dryer.

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Old 08-20-2011, 05:24 AM   #2
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Dryer venting


Boy....that is a long distance.......and as you may have already found out....there is a distance limit. What is your total distance?

I know the distance calculations are based on 4" smooth walled vent tube. I personally don't like the idea of a booster blower....what if it fails? Is there a pressure switch to shut off the dryer if the back pressure gets too high?

If you increase the pipe size to 6", you basically have doubled the volumn and reduced the restriction by quite a bit. Ball park a$$umption would lead me to think that a 6" pipe would double the distance you could go...but that is a lot of pipe.

Anyway you can find a different route?

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Old 08-20-2011, 07:02 AM   #3
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Dryer venting


How many changes of direction (elbows, etc.) are you going to have? That affects the airflow significantly.

I had a booster fan in one of my houses and never had a problem with it. You should have a small downward slope for the long horizontal section. That way, any condesation will run out. And use metal tape on the duct connections - screws trap lint and are a code violation.
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Old 08-20-2011, 09:51 AM   #4
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Dryer venting


Thanks for your help md21gyk and ddawg16.

It is a long run and will have 2 90's.

The slope and the tape are great tips.

From the dryer it will 90, then up 5 feet, then 90, then 18 to outside wall.

Will I have to clean out this pipe much?

Is the booster really necessary?
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Old 08-20-2011, 11:10 AM   #5
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Dryer venting


Your dryer installation instructions will tell you how many feet (including joints/elbows) it can run.
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Old 08-20-2011, 11:47 AM   #6
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Originally Posted by bob22 View Post
Your dryer installation instructions will tell you how many feet (including joints/elbows) it can run.
You also need to check local building codes. In my area, it's a max of 2 90's and 14' total. I believe you will find that to be pretty much standard in most areas.....
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Old 08-20-2011, 12:25 PM   #7
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Dryer venting


I don't know about 14' being a limitation, where many driers are able to run upto 40' without a booster. I wouldn't use a booster as I am sure that it will pull more than is needed from the source reducing the efficiency of the drier.Heres a guide I have locatedhttp://www.applianceaid.com/vent-length.htmlMark

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Last edited by Jackofall1; 08-20-2011 at 01:17 PM. Reason: Spacing
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