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4 Products for Enhancing Air Flow in Dryer Vents

Dryer Vent Duct Caked With Wet Lint From Restricted Air Flow

Dryer vent duct caked with wet lint from restricted air flowAfter I wrote an article this past week about the problem of restrictive wall caps reducing dryer vent air flow, I heard from David Williams, a fellow resident as well as a contractor who’s done a lot of work here at the condos where I live. He recently replaced a dryer duct in one of our buildings and took some amazing photos – like the one at left and the next one down.

After I wrote an article this past week about the problem of restrictive wall caps reducing dryer vent air flow, I heard from David Williams, a fellow resident as well as a contractor who’s done a lot of work here at the condos where I live. He recently replaced a dryer duct in one of our buildings and took some amazing photos – like the one at left and the next one down.

As you can see, the duct is caked with lint. And not only is it caked with lint, notice that the lint is soaking wet. It’s wet because all that water that came out of the wet laundry had to go somewhere, and for this dryer, it wasn’t making it all the way outside. In fact, it was so wet that water was dripping out of the duct at the joints, getting into the wood and the back of the drywall, where it was starting to grow things.

What? You say you’d like to see a close-up view of the inside of that duct? Well, OK, but don’t say I didn’t warn you.

Lint clogging a dryer vent because of reduced air flow

Now, is that enough to scare you to start taking apart your dryer vent or to call someone to do it for you? That’s pretty danged disgusting!

Although this article is about products that can help with dryer vents, I’m a big advocate of focusing on process first. So, before you go out and buy products to solve your problem, take a look at what processes might help here. First, if the dryer vent is too long, see if there’s a way to re-route it to shorten it. Second, realize that no products are fail-safe and that you’ll still have to do regular maintenance, even with the best products available.

Third, reduce the amount of laundry you do by wearing your clothes until your friends start commenting on the smell. Oh, wait, maybe that one’s not such a good idea. How about disposable clothes? Nah, too expensive. Anyway, the first two process suggestions above are really good ideas. Now let’s get to the products.

After publishing my previous article here, I posted it in a forum for home energy pros and got some good feedback about products that can help out. Since that article was about the wall cap on the outside, let’s start there.

Wall Cap. Everyone who chimed in with a product endorsement for this had the same answer: the Heartland Dryer Vent Closure.

dryer vent wall cap heartland 1dryer vent wall cap heartland 2dryer vent wall cap heartland 3

With this wall cap, the air comes out and exits upward. The pressure of the exiting air is great enough (with a well installed duct and dryer connection) that it levitates the plastic cap, which I’m holding in the right-most photo above. It’s not immune to problems (no product is), but when several home energy pros all mention the same product, that’s the one that I want to use in my house. And, at $18 from Energy Federation (one of my favorite sources for good home energy stuff), it’s a good deal, too.

Dryer Connection. Ed Voytovich of Building Efficiency Resources in upstate New York (and one of the funniest home energy pros I know) was the first one to mention the Heartland wall cap, and he also gave me the link for the Dryerbox, a better way to connect the dryer to the main duct.

dryer vent dryerbox

This prevents crushed, twisted, curled, and kinked ducts behind the dryer, another common problem that cuts the air flow, increases run time, and reduces energy conservation.

High Pressure Monitor. Ed also mentioned another product that I’ll be buying to install in my home – the LintAlert. It measures the pressure in the dryer vent and sounds an alert when it goes too high. If you visit their website, make sure you look at their page called Why You Need One and scroll all the way to the bottom to see what the a dryer fire can do to your home.

LintAlert, to monitor back pressure in dryer vents

Booster Fans. Sometimes, especially in multifamily buildings, the duct is so long that it’s just really hard to push that air all the way through, even with a perfect installation and a good wall cap. In that case, you might consider adding a booster fan. It’ll keep the air moving and cut your dryer’s run times.Dryer vent booster fan by Fantech Fantech makes high quality fans and sells one for this purpose, which you can buy from Energy Federation.

This is a bigger expense than any of the others, starting at around $170 for materials, and it also uses energy. In addition, you’ll probably have to add an in-line lint trap to keep lint from getting into the fan. Do everything you can to improve your dryer vent air flow before you decide you need to add a booster fan.

A Greener Alternative. Of course, if you really want to save energy and reduce the risk of a fire, the best product is only a few bucks and dries your clothes with solar energy – a clothes line!


A note about these product recommendations: Energy Vanguard doesn’t make any money from Energy Federation or the product manufacturers if you choose to buy one of these products, nor do we have any advertising or sponsorships from these companies. We’re a third party recommending products solely for the purpose of helping our readers.

This Post Has 10 Comments

  1. The pro’s suggest running pvc
    The pro’s suggest running pvc pipe when possible just like a water drain so that there is also slight fall to exit wall. The goal should be unrestricted exhaust. We will try it ourselves.

  2. Tommy, I’ve heard that
    Tommy, I’ve heard that suggestion before but forgot about it when writing this article. In terms of moving air, it would be way better than either sheet metal or flex. The former is mostly smooth inside but has joints and seams that can catch lint, and if it’s connected with screws, those catch even more. Flex is almost never pulled tight, and even when it is, it still has a lot of extra friction because of the wire spiral.

  3. Ewwwwwww. I’m extra glad I
    Ewwwwwww. I’m extra glad I hang my stuff outside. And I think my 14-year old has been following your “wear it until people run screaming from you” clothing advice. Now I know who to blame! 
    PS Can you please swing by on your way home from FL and check my ducts? I don’t want to do it myself in case I catch a horrible disease. Better it should be you – a professional!

  4. We just had an addition
    We just had an addition completed and we replaced the old galvanized ducts (dryer vent, bathroom vent fan) with PVC that were glued rather than fastened with screws.

  5. Sorry about that, Alexandra.
    Sorry about that, Alexandra. He emailed me one day asking for advice, and I told him just what I said above – keep wearing your dirty clothes – thinking that he, being a 14 year old would certainly do something different since I’m way past the age of credibility.  
    And yes, of course! Any excuse to go to Santa Barbara is a good excuse, even if it’s cleaning out a duct — Hey, wait a minute! Clothes lines don’t have ducts. Is that some kind of weird California thing?

  6. Thanks, Skip. Except for the
    Thanks, Skip. Except for the environmental problems of PVC, that sounds like a great idea. I’m not a purist on PVC, having installed it in the house I built as well as on contracting jobs, but I do recognize the problems and try to find other products when I can.

  7. I was afraid that you were
    I was afraid that you were going to never get around to the GREENEST (and Best) alternative … the Clothes Line! I built a Passive Solar room – where the 31 year old deck used to be (it had rotten joists and needed removal). I used recycled glass and “Cull” 
    (Twisted) lumber from Lowes “Cull Bin”. In that space I heat the house as well as dry the clothes – even on rainy days. The clothes line is just above the 5 dwarf Banana trees along the South Wall – all glass patio doors from the 80s which were removed and donated to Habitat for Humanity, where I bought them for $ 15 each. When the clothes drip, the drips water the Banana trees (Gray Water).

  8. Steve, I agree that the
    Steve, I agree that the clothes line is a great way to dry clothes and have used one many times. For many people, though, drying clothes outdoors isn’t an option because of the type of community they live in, as is the case in the condo that I live in. As you do, it’s still possible to air dry clothes. When I first went to Europe in 1985, dryers were uncommon. Even in winter, people air-dried their laundry – on racks indoors. That also has the benefit of helping to humidify what can be dry indoor air.  
    I’ve never heard of letting the clothes drip onto plants for watering, though. If they’re that wet, they must take a long time to dry. A good front-loading washer can spin them fast enough that they’ll dry a lot quicker.

  9. The Dryerbox is a very cool
    The Dryerbox is a very cool product.

  10. We recently moved into a
    We recently moved into a different house, and brought our washer and dryer, which are in great running condition. Our dryer runs for an hour and a half. Way too long, if you ask me. Our landlord took the PVC pipe off, and it was full of water and lint. Even after he cleaned it out, our dryer uses too much electrical time. I thought it was because the dryer vent is in the floor, then routes out side, which just seems like a very long distance. The landlord says when he lived here, it was used by him, and there was never a problem. 
    When there is absolutely nothing in the dryer, the tub gets hot, as it should, but for some reason, it takes a lot of time to dry a wash load of clothes. Is there any other suggestions you could give? Thanks, Lillian Gibbs

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