DFLX4 4' Ul2158a Listed Dry Duct (New)
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DryerFlex® model DFLX4 is building code and manufacturer approved 4” round transition duct and are designed for superior performance in connecting the dryer’s exhaust port to a home’s in wall dryer exhaust system. Building code and manufacturer adoption of DryerFlex as a superior solution is based on compliance with IMC 504.4 and IRC 1502.3 as well as a UL 2158A listing.
DryerFlex gets its flexibility, strength and fire resistant capabilities with 5 layers of 25 micron 100% aluminum ribbon, attached over galvanized zinc coated wire. The application method for the aluminum ribbon ensures a consistent 4” inner diameter whether it is fully extended or fully compressed.

Printable Product Comparison PDF
Comparison Summary: Foil
Like DryerFlex, foil transition hose is pliable and easy to work with. However, building code prohibits the use of foil in an attempt to reduce the number of fires caused by dryer exhaust problems. Foil duct has a narrower, rough interior that restricts airflow and a coating that is flammable.
Comparison Summary: Semi-rigid
Semi-rigid is accepted under standard building code because it maintains its 4" diameter and has a smooth interior. It is harder to work with, crushes easily and is difficult to twist. DryerFlex is also code approved with a UL 2158A listing, but it is very workable making it easier to connect the dryer.
The DryerFlex Advantage
DryerFlex outperforms other exhaust hose because of its unique design: all metal construction using five layers of 25 micron aluminum ribbon wound over galvanized, zinc coated wire.
Strength
This approach to building a better transition duct makes DryerFlex tough enough to protect against punctures or crushing, helping prevent efficiency loss and fire dangers. In the event of a dryer fire, this design can work to hinder fire expansion into the wall with torch tests up to 482 degrees showing zero flame spread or smoke development.
Flexibility
Some of the same features that make DryerFlex tough, including the wrap of multiple ribbon layers over a spiral wire, also makes DryerFlex easy to manipulate into the right bend for every dryer connection.
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