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  2. Metal ducts are often uninsulated, but can also be insulated. Flexible ductwork is made of a round wire coil usually covered in a bendable but very durable polymer (plastic). This polymer “skin” is usually surrounded by fiberglass insulation, then encased in a thin polyethylene or foil jacket.
    www.pickhvac.com/hvac-duct/types/flexible/
    www.pickhvac.com/hvac-duct/types/flexible/
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  3. HVAC Insulated-Flex Ducting Flexible Duct - Lowe's

    Whether you're venting your dryer or installing a bathroom exhaust fan, flexible ducts can help keep the air in your home healthy. A flexible aluminum duct's a simple way to vent a gas or electric dryer without having to install elbows to go …

     
  4. Insulated Flexible Duct - Lowe's

    Find Insulated flexible duct at Lowe's today. Shop flexible duct and a variety of heating & cooling products online at Lowes.com.