The Helios DDF 355 G is designed for use as a roof-mounted fitting for both air intake and exhaust applications, as well as for connecting ventilation ducts with standard diameters. Its wide, continuous rolled lead flashing allows it to conform easily to various tile types and roof contours, particularly on saddle roofs. Constructed with a galvanized sheet steel support plate and components, this unit ensures durability and secure installation. The protective hood comes in a slate grey finish for a discreet appearance.