3" 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 & compressibilityExcellent resistance to crushing, flex fatigue, tearing, and moisture Stomp on it and it returns to shape without damage Shove it thru tight openings and overheads and it delivers full airflowApplication:Rugged blower duct hose for heat, ventilation and air conditioningSpecifications: Temperature Range: -40°F to +225°F (-40°C to 107°C) (when insulated)Length (feet): 50' BoxedInner Diameter (inch): 3"*Meets FMVSS 302 flame resistance