DESCRIPTION

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

Flexible Technologies 25 ft. R4.2 KM Insulated Flexible Foil Air Duct

FKM25

Diameter:

SPECIFICATIONS

ASTM Specifications
ASTM C-518
Diameter
4 in
Inside Diameter
4 in
Length
25 ft
Maximum Airflow
5000.0
UL Listed
Yes

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