Casing
Casing from galvanised steel. 50 mm rockwool acoustic and thermal insulation with a internal surface liner which prevents the migration of fibres into the airstream.
Motor
Voltage controllable external rotor motors.
Impeller geometry
Double inlet centrifugal impeller with forward curved blades.
Output control
Speed controllable via voltage reduction using a thyristor or transformer.
Motor protection
With integral thermal contacts with manual reset in accordance with EN60335-2-80.