Dundas Jafine AF325UL Flexible Duct, AF-UL Series TYPE, Length: 25 FT, Maximum Temperature: -20 To 250 Deg F, Inside Diameter: 3 IN, Round Duct, 3-Ply Aluminum Foil Laminate, Static Pressure: 10 IN WC Positive, 1/2 IN WC Negative, Maximum Velocity: 5500 FPM, C/US UL 181, Marked Class 1 Air Connector, NFPA 90A And 90B, BOCA, ICBO, SBCC, HUD/FHA Min Property Standard, ADC Certified Standard, For General Purpose Exhaust Applications Including Heating, Air Conditioning, Exhausting And Fresh Air Intakes Application