PRODUCT PARAMETERS: Ducting Size: 4 Inch | Length: 25 Feet | Ducting Material: PVC Thermoplastic (lightweight, high-strength & low fluid resistance), Aluminum (high-quality, high-temperature & corrosion-resistant). Clamps Material: Stainless Steel (strong and sturdy). EXCELLENT PRODUCT DESIGN: We designed this aluminum duct according to your Grow Tent needs, flexible ventilation ducting constructed of aluminum and PVC thermoplastic, our ducting is designed for various ventilation, circulation, and heating/cooling transfer applications. 4-LAYER TOUGH: Our dryer hose features four-layer protection, making it more durable and resistant to leaks than single-layer designs, the internal layer is made of heavy-duty dual aluminum foil that is fire/flame resistant, the outer layer adopts black dual PVC thermoplastic that protects the aluminum from cuts and tears while preventing leakage. EASY TO INSTALL: 1 pair of 4-inch metal clamps made from stainless steel makes the installation a breeze, the duct ventilation is super flexible and can be easily cut by wire cutter and paper-knife, the hose can be bent at 360� and freely stretched as well, it will slide right on your Duct Fan, Vent Exhaust, Carbon Filter or Light Reflector. WIDELY APPLICATIONS: Our ducting tubes are suitable for heating ventilation & air conditioning system. It will move and deliver air in hydroponic grow rooms and tents, inline fans, bathrooms and attics, heating and cooling transportation, and other installations, it is also used to cool AV equipment rooms, closets, racks, and cabinets.