4 x 50 Blue Polyduct Blower HoseTrident Polyduct is the most flexible, crush-proof, and rugged blower duct hose for heat, ventilation, and air conditioning* (HVAC)heavy-duty polypropylene hose, reinforced with a flexible polypropylene rod helix.Features: Excellent flexibility compressibility Excellent resistance to crushing, flex fatigue, tearing, and moisture Stomp on it and it returns to shape without damage Shove it through tight openings and overheads, and it delivers full airflow Application:Rugged blower duct hose for heat, ventilation, and air conditioningSpecifications: Temperature Range: -40F to +225F (-40C to 107C) (when insulated) Length (feet): 50 Boxed Inner Diameter (inch): 4 *Meets FMVSS 302 flame resistance table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Truck Freight: No Oversized: No