The Helios HDH 200 is a horizontal roof ventilation cowl designed to cover and protect convection exhausts and supply air outlets on rooftops. Featuring the same design aesthetic as the Helios RD series horizontal outlet roof fans, this unit ensures seamless visual integration. Constructed for reliable performance in ventilation systems, it is suitable for both natural and mechanical airflow applications. When integrated into mechanical systems, designers should account for the associated flow losses as shown in the technical diagrams.