Design features
The high-efficiency ERS/DRS centrifugal fans have been developed for use in modern ventilation and air conditioning applications and are well suited to move air and lightly aggressive gas and vapours. The size comply with standard R20 in accordance to DIN 323 . The designation of size corresponds to the outside diameter of the impeller.
Casing
The casing is manufactured from galvanised sheet steel. Side plate and scroll plate are joined together by a rolled seam. Mounting brackets can be fitted to the fan side plate in steps of 90°.
Impeller
The centrifugal impeller is made of galvanised sheet metal and is fitted directly to the external rotor motor. The motor-impeller-unit is balanced in two plains according to G 2,5 (DIN ISO 1940).
Electrical connection
Motors come with flying lead. The electrical connection is made via an IP44 terminal box, which is supplied loosely. Single-phase motors are delivered with the capacitor fixed to the terminal box.
Sense of rotation
The direction of rotation ERS type fans is clockwise, viewed from the inlet side. For DRS type fans it is counter-clockwise, viewed from the cable outlet side.
