... VelocityMax 25m/s 3.compressible durable and lightweigh Rectangle Aluminium Flexible air Duct Velocity of Air flow (MAX.) : 30m/s temperature range ... , clothes dryers,range hoods, etc.1. It is a multiply Aluminium Polyester Laminated ducting with an en-capsulated high tensile steel ... on fire resistance6. Low costs on transport and logistic. Rectangle Aluminium duct