SRB Insulated Flexible Air Duct

Sizes Available: 4" 5" 6" 7" 8" 9" 10" 12" 14" 16" 18" 20"

Benefits of the SRB

  • Manufactured with triple foil laminate casing with scrim reinforcement & double sealed core (SR Core)
  • Wrapped in Owens Corning® R4.2 insulation to maintain temperature and keeps noise to a minimum
  • Fire retardant black polyethylene vapour barrier adds extra durability
  • Inhibits the growth of mold and mildew for better air quality
  • Duct components are flame resistant and self extinguishing
  • Oversized to fit easily onto connectors and fans
  • Convenient and quick installation will help reduce costs
  • Maintenance free when installed according to manufacturer’s guidelines
  • Complies with NFPA standards 90A & 90B
  • c-ETL-us certified for peace of mind and conforms to UL181 standards & CAN/ULC-S110-M86
  • Marked approximately every foot for easy installation / instructions included
  • Made in North America with strict quality controls
  • Distributed by an extensive continent-wide network of wholesalers
  • Available in 25’ and custom lengths as a special order


ThermoFlo Technologies guarantees the SRB Insulated Flexible Air Duct to be free from defects from the date of manufacture. The warranty is void if the duct is installed in any way that is inconsistent with installation guidelines provided by ThermoFlo Technologies.

Data Sheet for SRB

Norminal Inside Diameter (in.): 4 5 6 7 8 9 10 12 14 16 18 20
Length (ft.): 25
Pressure (in. water column) Positive: 10" (4-14 in. dia.) Negative: 1" (4-14 in. dia.)
Velocity 5000 Feet per Minute
Temperature Minimum: -20° F / -29°C Maximum: 250° F / 121° C
Surface Burning Characteristics Max Flame Spread < 25 Max Smoke Dev. = 50