4 in. x 25 ft. Flexible Air Duct R4.2

Part #FKMP25  |  Item #794737  |  Manufacturer Part #0537-0400-0001

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Product Details

  • Insulated
  • Reinforced Metalized vapor barrier
  • Polyester inner core for low to medium pressure systems
  • Velocity 5,000 fpm
  • Flame spread less than 25, smoke developed less than 50
  • Operating temperature -20° F to 250° F
  • R value: 4.2 using ASTM C-518 (1991) at installed wall thickness on flat insulation only
  • UL 181 listed class I air duct
  • Complies with NFPA standards 90A and 90B
  • Meets FHA standards


ASTM Specifications: ASTM C518

Diameter: 4 in

Duct Shape: Round

Length: 25 ft

Material: Fiberglass, Plastic, Steel

Material Type: Polyester

Maximum Airflow: 5000

R value: R4.2

UL Listed: UL 181