The aluminium foil flexible ducting ventilation is made of 3003 و 8011 ورق ألومنيوم, which is continuously and tightly compressed by a spiral. The aluminum flexible air duct ventilation is formed by embossed aluminium foil, which is fireproof, heat-resistant and pollution-free, it is an important component of a new generation of green and environmentally friendly ventilation systems. The flexible ducting ventilation hose is made …