New series of plug fans

Plug fans - centrifugal fans

Compact, quiet and efficient

impeller comparison plug fans
The impeller was optimised again for the new series; compare before (left) and after (right)

In light of increasingly stringent environmental and economic requirements, ebm-papst offers a so-called plug fan series, which was designed specially for operation in ventilation and air-conditioning technology. Available in 12 sizes with impeller diameters of 250 to 900 mm and drive outputs of 400 watts to 6 kilowatts, the new designs cover all conceivable applications in the field of ventilation and air-conditioning technology or in climate control systems (so-called HVAC systems). The feasible air flows lie between 300 and 30,000 m³/h.

The overall efficiency and acoustic behaviour of the fans has been significantly improved for the new plug fans. The new blade geometry with a diagonal trailing edge has positive effects on the aerodynamic behaviour and on the running smoothness of the fans. The same is true for the implemented nozzle contour. Previously, a standard pressure tap was integrated here to regulate differential pressure via a threaded nipple. A ring line is also possible on request.

Space savings by using EC fans (top) versus systems with an AC fan and belt drive (bottom).

Plug fans are very compact because the EC motor is integrated directly in the impeller. A belt drive between the motor and the fan, which is commonly used otherwise, is not necessary. This reduces not only the required installation volume – always desirable for ventilation and air-conditioning technology – but also the associated installation effort.

The power electronics integrated in the EC motors are compatible with all common supply voltages; depending on the motor type, either from 200 V to 277 V for single-phase AC or 380 V to 480 V for three-phase current supply. The frequencies lie at 50 or 60 Hz, respectively. The air performance and efficiency are unaffected by frequency changes. This means that the same fan type can be operated on different power systems without further ado.

The fans are designed for a service life of more than 40,000 operating hours. That corresponds to a continuous operation of more than 4.5 years, operating under full load and at the maximum permitted ambient temperature. When operating under partial load or at lower ambient temperatures, the value is significantly higher.

The "spider mount" allows a variable installation position of the fans – installation is possible with either a horizontal or a vertical motor shaft position. The large sizes are intended for horizontal installation, where vibration elements can be attached to the base frame to provide isolation from the environment. Additional optional measures can also be realised to enhance resistance to corrosion. This means that the fans can also be used in hygiene equipment.

With this EC plug fan series, highly efficient, easily regulated and high-performance fans for ventilation and air-conditioning technology are easily accessible. The fans significantly exceed the requirements of energy efficiency class A+ stated in German manufacturer's association RLT Directive 01, "General Requirements for Ventilation and Air-conditioning Devices" (for more information, visit www.rlt-geraete.de ).