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 16 inch. diameter and an integrated spring steel wire support coil which is flexible for expansion, compression and angled turns. It's great for heating, air conditioning, dehumidification, blower, ventilation and exhaust jobs in a variety of industrial, residential, and construction applications. An optional ducting hose adapter kit (16DHK) is available to connect ducting to the XPOWER X-41ATR, X-47ATR and X-48ATR Axial Air Mover Blower Fans.