<b>Specification:</b><br><br> · Inner duct: Perforated Alium foil<br> · Middle layer: Glass Wool （20kg/m³ density）<br> · Outer sleeve: 1 Alium + 1 Polyester lamination<br> · Tempreture range:-30℃ to 150℃<br> · Color: White<br> · Size: 5 inch X 16ft<br><br> <b>Feature:</b><br> 1. Thick layer of PVC on Hon&Guan ducting prevents light leaks. Works with exhaust and intake fans, carbon filters and hooded lights which are 5" in diameter.<br> 2. Under the 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.<br> 3. Designed for reducing noise from fans and carbon filter systems, can decrease the noise by up to 50%.<br> 4.Hon&Guan Ducting Is suitable for Heating Ventilation & Air Conditioning 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 etc. <br><br> <b>Package Includ:</b><br> 1X Hon&Guan Flexible Ducting