I've discovered a dryer transition duct that is far superior to anything else I've ever seen - it's called DryerFlex. I found this product while writing a recent blog post on dryer transition ducts, and I actually mentioned it at the end of that post. The DryerFlex dryer transition duct is a cross between foil and semi-rigid aluminum, but it outperforms both of those materials in every way possible.
The video below, made by the manufacturer of this product, does a good job of comparing this material to foil and semi-rigid dryer transition ducts.
At the end of the video, they say they're confident this product will be rapidly adopted and become the industry standard.
After testing this product myself, I believe it.
To start my testing, I used the same test methods that I used to test the other dryer transition ducts - I filled the duct with shredded paper, started it on fire, then used a wet/dry vac to fan the flames. I also tested a rigid metal duct made from thin-gage aluminum, just for the heck of it. Rigid metal is approved by code to use as a dryer duct - not a transition duct, but an actual duct. I did this by connecting two two-foot pieces together.
Solid Aluminum Duct
As you can see in the photo below, the solid aluminum duct failed where the two pieces connected together, but only after I had burned through most of the paper in the duct.
DryerFlex Transition Duct
The results of my burn test with the DryerFlex duct were quite surprising... and unfortunately, I don't have any good photos to show you. It was a very boring test, because I burned through all the paper and the DryerFlex duct never failed. I couldn't believe it. The photo below shows the DryerFlex material laying on the ground after the test. I bent it up just to show that it was still capable of holding it's shape.
Because my testing method was subject to so much variability, I tried a more controlled burn test to compare different materials against the DryerFlex. I held a torch 2" away from each duct and timed how long it took to burn a hole through the duct.
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