Roof fan VD

■ Specification Roof fan with vertical discharge made of glass-fibre reinforced polymer. ■ Casing The upper and lower shell, motor protection cover and base plate with inlet cone are made of glass- fibre polyester. Base plate with threaded bolt for connection of intake air accessories. ■ Impeller High performance backward curved centrifugal impeller made of galvanised steel, dynamically balanced with the motor unit. ■ Motor Totally enclosed external rotor motor with ball bearings, protected to IP 44. insulated for protection against moisture. Maintenance free and radio suppressed. ■ Motor protection Through built-in thermal contacts connected in series with windings. Deactivated automatically at higher motor temperature and activated again after cooling dcwn.