Helios Ventilatoren Roof fan VDW EC 225 B Manufacturer :Helios Ventilatoren Designation :Roof fan 1-PH, 230 V,EC motor Type :VDW EC 225 B Mains frequency :50 Hz Rated voltage :230 V Housing material :Aluminium Surface protection housing :other Integrated automatic closing flap :no Volume flow :1740 m³/h Rated power :0.244 W Medium temperature :-20..50 °C Protection class (IP) :IP54 Nominal duct diameter :225 mm Helios Ventilatoren roof fan VDW EC 225 B: Further details Vertical discharge EC roof fan with efficiency-optimised aluminium housing and newly developed high-performance centrifugal impeller. Housing made of seawater-resistant aluminium with integrated intrusion protection. Motor support plate and base plate with inlet nozzle made of galvanised steel. Base plate with threaded screws for attaching suction-side accessories (hole pattern to DIN 24155, sheet 3). Protective grille as standard on the outlet side in accordance with DIN EN ISO 13857. High-performance centrifugal impeller with backward curved blades made of galvanised sheet steel. Dynamically balanced in accordance with DIN ISO 1940-1. Energy-saving, speed-controllable EC external rotor motor in enclosed design in IP 44 with maximum efficiency. Ball bearing mounted with moisture protection insulation. Maintenance-free and interference-free. Integrated electronic temperature monitoring for EC motor and electronics. Standard with external terminal box in protection class IP 65. Infinitely variable speed control with potentiometer or infinitely variable speed control with universal control system. EAN: 4010184072409.