| | | MFB20A05, Noise Optimization Noise data always refers to fans suspended by elasticated ropes in an anechoic room. This type of measurement records the noise that is caused not only by air turbulence but also the noise that is emitted by the fan itself and is measured at a distance of 1 meter. When installed in units, the noise characteristics of fans alter considerably. Especially in the case of small fans, the airborne sound is insignificant whereas the solid-borne sound that is emitted from the housing panel predominates. Under unfavourable conditions, it may result in harmful resonance that may even damage the industrial bearings. However, it is impossible to make a prediction as too many, partially unknown factors can influence the situation, e.g. speed, motor system, rotor weight, mechanical stability of the housing panel, fixation damping. The smaller the fan is, the more important it is to optimize fixation. The MFB20A05 should be soft-mounted in a housing, on no account without damping. A simple, favourably priced form of adhesion via the edges of the frame with double-sided adhesive PE foam tape, e.g. TESAFIX 4952 (04952-00040-00, 19mmx1.2mm, roll) has stood the test. As the fan weighs only a mere 4 g, adhesive tape manufacturer mounting is extremely stable. For screw-mounting, we can recommend two diagonally attached cable bushings (ET-TINGER 14.70.010 or 14.070.020). We can supply you with all types of mounting fixtures. We can help you to find the best possible type of mounting for your application, so please do not hesitate to contact us. A sample of your unit would be of great advantage so that we can carry out test-mounting and then give you a demonstration. | | |