S series Product specification: Single/double inlet forward-curved centrifugal fans in scroll housings. Available in frame sizes 280 to 400 mm (single-ended) and 200 to 400 mm (double-ended). This allows for volume flow rates of up to approx. 14,000 m³/h and static pressures of up to 1,150 Pa. Properties & special features: Scroll fans in the S series are characterised by their compact housing design and high output density. The high number of blades means the fans have good sound characteristics with very little noise produced by the blades rotating. Optimum motor cooling and compact design due to voltage variable external rotor motor in the impeller. Option of housing with discharge flange and fastening brackets. Motor concepts: External rotor motors: AC technology