cuchiilo 10 inch 25 feet insulated flexible duct r4.2,10 inch flexible duct 10 flex duct insulated hvac ac flex duct 10 inch insulated flexible duct hvac,for heating and air conditioning hvac systems 10 in 25 ft r-4.2 insulation is up for auction in Industrial & Scientific. This item is in New/Like New condition. Bid on this item at our Louisville - Intermodal Dr. location before the auction closes.