... airtight 3.compressible durable and lightweigh aluminum ducting flexible hose 1.Aluminum fexible duct2.fireproof and airtight3.compressible ... resistanceAluminum Flexible DuctConstructed of a heavy duty 3-ply, aluminum foil laminate, encapsulating a high density, corrosion resistant ... exhaust system,HVAC , rang hood ,clothes dryer vent ,inline fan air vent ,roof ventilation , ventilator use ,And so on ...