Honandguan 5 Inch Air Duct - 16 Feet Long, Black Flexible Ducting, And Kitchen. LOW NOISE SILENCER: designed for reducing noise from fans and carbon filter systems, can decrease the noise by up to 50%. 5" DUCTING LIGHTPROOF: Thick layer of Black PVC on Hon Guan ducting prevents light leaks. Works with exhaust and intake fans, carbon filters and hooded lights which are 5" in diameter 3-LAYER TOUGH: Keep your ventilation system free of rips and pin holes. Under the Black PVC layer our ducting is built with 2 layers of Aluminum Foil With a layer of PET and Steel Wire Helix to preserve the shape,keep your ventilation system free of rips and pin holes FLEXIBLE AND EASY TO USE: Hon Guan 5 Inch Duct is super flexible and easy to install, it will slide right on your Duct Fan, Vent Exhaust, Carbon Filter or Light Reflector.This Ventilation Duct is 5 Inches in diameter and comes in one 16 Feet Long Piece, which can be cut into as many pieces as you need using a wire cutter and a paper knife VARIETY OF APPLICATIONS: Hon Guan Ducting Is suitable for HVAC system. It will move and deliver air in Kitchens (cooking exhaust), Green Houses and Grow Rooms (Air Circulation, Intake, Exhaust and Light Fixture Cooling), Bathrooms (Smell and Moisture Exhaust), Dryer Rooms, Grow Tents and other applications etc.