STEELSOFT 4 inch aluminum foil flex duct hose is in narrower wire helix and foil accordion design to keep stronger structure and less pressure drop. It is constructed with extra thick 6-ply laminate for super tear & pet puncture resistance. -Features- 1.Extra thick for prevent crushing easily and pet scratching. 2.High heat available to meet safe local building codes. 3.No plastic smell like PVC type when dryer is running. 4.Key type dryer vent clamps for handy use. 5.Widely used for dryer vent, grow tent and portable ac etc. Operating temperature Range: 0? to 215? Recommended Velocity: 5000 FPM Recommended Operating Pressure: 6'' w.g. positive Diameter: 4'' Stretched Length: 3 FT Hose Clamps: 2 PCS