3" Blue Polyduct Blower Hose - Sold by the FootTrident 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:Sold by the footExcellent 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)Inner Diameter (inch): 3"*Meets FMVSS 302 flame resistance