This XPOWER 25 ft. long ducting hose is a rugged PVC vinyl-coated polyester fabric hose with a black external PVC strip which resists exterior damage when dragging. This hose features a 12 inch. diameter and an integrated spring steel wire support coil which is flexible for expansion, compression and angled turns. Great for heating, air conditioning, dehumidification, blower, ventilation and exhaust jobs in a variety of industrial, residential, and construction applications. This model is also compatible with the XPOWER X-12 Confined Space Ventilator Fan.