Home   |   Products   |   About Us   |   FAQ   |   Contact Us   |   Technical Support   |   Search Hi-Velocity Flexible Duct Quick and Easy Installation!    Flexible Duct Brochure Hi-Velocity Flexible Duct can be installed quickly and easily, delivering the air quietly with a sound absorbing inner core. The inner core is made of a double lamination of foil laminate and clear polyester film which is interlaced with a galvanised steel wire (.041) having a 3/4” pitch. The core is wrapped with fibreglass insulation certified “GREENGUARD” having a coefficient of R4.2/R8.4 and is encapsulated by a metalized vapour barrier reinforced with fibreglass string.   Our HE duct has been designed as a direct alternative for two 2” flex duct used in the Hi-Velocity System. No changes are required to air handler selection and main plenum duct sizing. e.g. 1 - 10’ length of HE duct is the equivalent of TWO 2” -10’ flex lengths.   The Perfect Choice for Retrofitting Older Homes! Technical Notes UL Listed Air Duct, Class 1 Maximum Rated Velocity: 5000 ft/min and/or 25,4 ms Maximum Rated Positive Pressure: 10 in. W.C. and/or 2.5 Kpa Maximum Rated Negative Pressure: 0.5 in. W.C. and/or 0.12 Kpa Maximum Flame Spread: 25 Maximum Smoke Developed: 50 Standard UL 181 Standard CAN/ULC-S110M Outside Diameters of Flexible Duct: 2" - R4 = 4.5" (114mm) 2" - R8 = 6.5" (165mm) HE - R4 = 5.5" (140mm) HE - R8 = 7.5" (191mm) Call us to discuss your application today!  1-888-652-2219