... airtight 3.compressible durable and lightweigh combine flexible duct 1.Aluminum fexible duct2.fireproof and airtight3. ... logistic..No special tools required for cutting or fixing.Flexible, compressible & fully "fully retardant".It is robust ... Aluminium flexible duct ,the duct mainly engaged in ventilationsystem, like bathroom and kitchen venting system, hydroponics exhaust system,HVAC , rang ...