Twin-fan ventilation units

To provide continuous ventilation with standby fans, Helios offers units with two fans from 125 to 500 mm diameter in a single casing with both inlet and outlet connection. Larger sizes are available to order. TFD duct-mounted fans are designed for internal installation. Depending on mounting, access can be from above or below. When using the Helios electronic controller, stepless speed control from 20 to 100% can be achieved. The roof-mounted TFR models offer weather protection and outlet louvres, with a rear-mounted inlet spigot for circular ducting. Acoustically lined units offer lower sound levels and reduced breakout for noise-sensitive areas. Changeover panels are available to match the fans. heliosfans@aol.com