M series Product specification: The single-ended extracting, backward-curved motor impellers in the M series are intended for use without spiral housing. Available in frame sizes 225 to 500 mm. This allows for volume flow rates of up to 5,500 m³/h and static pressures of up to 2,100 Pa. Properties & special features: Versatile series with different wheel widths for applications with demanding mechanical requirements, such as railway systems or high temperatures in drying plants. The motor impellers are also available in an ATEX version. Motor concepts: External rotor motors: AC technology