Hangzhou Dongxing Telecommunication Material Co.,Ltd is one of the professional China aluminum foil flexible air duct manufacturers and suppliers, and equipped with a productive aluminum foil flexible air duct factory and company, welcome to contact us.Product Details    Key Specifications/Special Features: Aluminum Foil Flexible Air Duct>Designed especially for high pressure and low pressure ventilation (e.g. range hood) and air conditioning system with the easy-fixing hose clamp.>Made of 1 layer or 2 layers of aluminum foil with the spring wire.>Diameter is from 4 to 16 inches.>Standard length is 10 meters or as customized request.>It