As I said, check it out:
From the Proflex website:
In the past, the most common practice for venting clothes dryers was the use of vinyl ducting. Although vinyl ducting is suitable for bathroom fan applications and general purpose exhausting it is not recommended for clothes dryer venting. ProFlex is U.L. 2158A Listed as a Clothes Dryer Transition Duct. It is designed to vent both gas and electric dryers. It is made from a fire resistant 4 ply aluminum foil laminate. ProFlex is available in dryer vent kits as well as multiple length ducting.
The aluminized or metalized polyester are not recommended. Even the two ply aluminum foil laminate is not recommended for dryers!
Flexible Metalized Foil Ducting
- Class 1 Air Connector
- Ideal for use in general purpose exhaust applications including bathroom fans.
- Maximum operating temperature is 250° F.
- Made from a 2 ply aluminum foil laminate.
*]Not Recommended for Clothes Dryer Venting.