Flexible Air Duct; Type Class 1, Plain End; Insulation Type R-8; Burning Character Maximum Flame Spread 25, Maximum Smoke Developed 50; Air Velocity 5000 FPM; Rated Positive Pressure 12 Inch WC; Rated Negative Pressure 3/4 Inch WC; Jacket Material Silver Metalized Polyester; Core Material Black Polyester; Length 25 Foot; Width 4 Inch; Temperature Rating -20 to 140 Deg F (Continuous), -20 to 250 Deg F (Intermittent); Applicable Standard UL 181, IMC, UMC, NFPA 90A/90B, HUD; Packaging Type Boxed/Bagged; Application Residential, Commercial