... warm or cold air through. Flexible air hose for air conditioning device in airport is a new product developed by Xianyang Yuhua ... ., according to American Militry technical specification, which is mainly used for transporting cool or warm air to air-plane. The product ... , Φ200, Φ250, Φ280, Φ300, Φ320, Φ340, Φ360, Φ450mm, meanwhile, we can also design and manufacture in accordance with the user's need ...