Providing R4 insulation value, Flexaust® Arctic Duct U Insulated Blower Hose features 1 in. fiberglass insulation barrier that is protected by 2 single-ply fabric polyester plies and reinforced with spring steel wire helix and external PVC coated wearstrip. Hose operates from -40 to 250°F and has 5:1 compression ratio for storage. Manufactured from flame-retardant materials, hose comes in 4–20 in. ID sizes with plain sewn cuffs or optional belted cuffs.