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Insulated Flex Duct 4" x 25' may be used in certain circumstances, however we suggest using rigid ducts whenever possible.
ASTM Specifications: ASTM C518, ASTM E96
Diameter: 4 in
Duct Shape: Round
Length: 25 ft
Material: Plastic, Steel
Material Type: Polyester
Maximum Airflow: 5000
R value: R4.2
UL Listed: UL 181 Class 1
