... and let the warm or cold air through. Flexible air hose for air conditioning device in airport is a ... under bent state condition. 2> Nominal inside diameter: Φ80, Φ90, Φ100, Φ120, Φ180, Φ200, Φ250, Φ280, Φ300, Φ320, ... Heat insulation: when cold or hot air through the hose under normal condition, the average temperature ... . service life: two years flexible air hose for air conditioning device in airport