Properties:Aluminum Foil Air Duct is made of aluminum foil and steel wire. RoHS approval.High flexibility and axial compressibility, extension rate is around 1:10flame and heat resistantAluminum foil thickness: 0.035mmAvailable Szies: 75mm to 750mmTemperature range: -30°C +140°CMaxim Air Flow: 30m/sMaxim working pressure: 2500 paStandard Length: 10m/pcApplication:The aluminum foil air duct is especiallyideal for high pressure and low pressure ventilation system, like range hood.It can be fixed directly on the fittings. In case of fire or high temperature, there is no toxic gas. Specification: ID (mm)steel wirePitchBox1020.930115*115*4301270.930140*140*4301521.035165*165*3801651.035175*175*3802031.240215*215*3802541.245265*265*3803051.245310*310*3803151.245330*330*380other sizes can also be ordered.