... or cold air through. Flexible air hose for air conditioning device in airport is a new product developed by Xianyang Yuhua ... under bent state condition. 2> Nominal inside diameter: Φ80, Φ90, Φ100, Φ120, Φ180, Φ200, Φ250, Φ280, Φ300, Φ320, Φ340, Φ360, Φ450mm ... nylon with PVC or CR, and have good performances in sealing, age-resistance, heat resistance and cold resistance, etc.. Heat insulation ...