4-layer protection: The inner layer of the flexible duct hose is made of flame-retardant double aluminum foil, and the outer layer is made of gray double PVC thermoplastic, which protects the aluminum from cuts and tears while leakage. Transport: Used for air transport and discharge. Our ducted air vent hoses play an important role in transporting and removing air in hydroponic grow rooms and tents, in-line fans, bathrooms and attics, heating and cooling transport, and other facilities. Wide range of applications: Designed for ventilation applications, this flexible duct air vent hose can be used in HVAC, dryers, grow rooms, and tents accordingly. Stainless steel fixing clips: This flexible duct hose kit comes with two stainless steel fixing clips, which are sufficient for fixing and stable use. Is your best choice, perfectly matching the parts you need to replace., Weight: 0.110231131 Pounds, Manufacturer: HAEUYA