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- Brand: The Unico SystemType: InsulatedLength: 10 ft
- Tough aluminized Mylar outer wrap|Spun-bonded nylon and helical wire core|This consists of ten foot long return air duct made out a sound attenuating material that is 18 in ID|1 in fiberglass insulation
- The Unico System Return Air Duct, Insulated, 18 in Inside Dia, 10 ft Length, R4.2 Insulation Value, For Use With: M3642 Return Air Cooling Module, Aluminum