Suggestions how to run dryer vent to improve flow

Old 09-15-23, 12:17 AM
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Suggestions how to run dryer vent to improve flow


Just installed a new LG dryer. It connects to a 4 inch pipe that elbows down inside the wall (90 degrees down) goes 6 inches to then 90 degrees level to flow out to my back yard (12 foot run). Yeah, it is a LONG distance but most of that is straight. What I'm worried about is I know my current install is wrong; this sharp 90 is blocking airflow as my first run with this dryer gave me the D80 code (or 80% blocking). Note my flexible tube is brand new. I also blew out my existing pipes before install, so they are mostly clean. I'm also sure the vent on the outside of the house has some restrictions cause it is a flapper design and I probably shore replace that.

Clearly all shorts of issues. For now, I would appreciate some ideas how to improve what I have. One thought I have is to go buy a 90 hard angle, smooth pipe, than another 90 degree so I remove the flexible completely. Just now sure if that will even help that much. I probably should also buy the side vent kit for the dryer.

Old 09-15-23, 01:00 AM
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Yes, the rigid/smooth pipes and elbows would help a lot. Sounds like there isn't much you can do beyond that anyway.
Old 09-15-23, 09:43 AM
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Side vent will probably be the best solution but you could also try a dryer vent periscope fitting in place of the flex. An in-line booster fan on the straight duct is also a possibility.
Old 09-15-23, 09:51 AM
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I agree with rigid pipes and elbows but I would do more. Consider opening the wall to eliminate (it sounds like) two 90 degree angles - one in the wall and one in the exposed pipe. Doing so should also make it easier to clean the vent pipes and will allow you to use the felxible pipe. They're called recessed boxes or you can do something similar, yourself.

This what it would look like, but in reverse:


Last edited by Tony P.; 09-15-23 at 10:01 AM.
Old 09-15-23, 10:19 AM
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Or a dryer periscope vent can eliminate your kinky flex duct.

Any 90 degree elbows below the floor on its way to the ehaust vent can be changed to double 45s to avoid as many sharp turns as possible.
Old 09-15-23, 02:43 PM
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Try installing the two 90's first eliminating the flex duct.
Old 09-17-23, 07:28 PM
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Well, I used 2 90 degree pipes and dryer tested as normal. It has an exhausting vent test mode. So that worked. Thanks for the advice.

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