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Axial fans AND/ANDB with adjustable blades

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Technical description

Axial fans with adjustable blades cover a wide capacity range due to their large variation possibilities with hub relation, number of blades and blade angle. With the Rosenberg AND/ANDB series pressure increases up to 1.200 Pa and volumes up to 85.000 m3/h can be realized. The allowed temperatures of the conveyed mediums are from -20 °C up to +40 °C as a standard (Follow description of motor manufacturer. Special motors for higher temperatures up to 100°C on request).

The casings with defined flange master-gauge for holes ensure an easy connection to the duct system. The standard air flow direction is pressured over the motor. To reverse air flow direction

blade position must be rotated 180° and the direction of motor rotation must be changed. The fans are suitable for vertical and horizontal installation. By operation with frequency converters please see the table on page 4.



The casings are made of hot-dip galvanized steel as a standard. On request the casings can be supplied plastic-coated. The casings can be equipped with a service access. In the long version L, the casing, the motor and the blades are covered. In the short version K, the motor juts out. Motor cable with flying ends passing through the casing. A terminal box can be mounted or delivered as separate accessory on request. Also available are inlet cones and protection guards, mounting feet with two steel flanges as well as mating flanges, vibration dampers, adapted to the casing.



The axial impellers are balanced on quality level G 6,3 according to DIN ISO 1940. The hubs of chilled casting aluminium are made in two parts and have removal drillings for easy dismounting of the impeller. Diameter of hub and number of blades see page 10. The profiled blades are made of aluminium diecast, in standstill the blade angles are adjustable. If the blade angle is adjusted after delivery the power requirement must be checked for overload of the motor. The impeller has to be balanced after blade adjustment. The blade angle αis measured on the wing tip. The number of blades is variable, which expands the performance range and allows any operating point.



3-phase IEC standard motors of type B3 with protection class IP 55, insulation class F in 2-, 4-, 6- or 8 pole execution are used. Pole-changable, voltage-controllable, invertor motors and single phase A.C. motors or motors for higher airflow temperatures are available on request.


Safety protection

The fans are designed for installation in a ventilation system and therefore supplied without protection guard as a standard.

The user has to make sure before initial operation that safety protection is ensured according to EN 12100-1 / -2.




Download the technical spreadsheet


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