Patented membrane protects against moisture Special protective measures are required for fans that are directly exposed to environmental conditions such as extreme humidity or rapid temperature fluctuations. Moisture can accumulate when temperature fluctuations occur frequently, for example in on/off operation, leading first to corrosion and then to failure of the electronics. ebm-papst has developed a housing with a special patented membrane to provide optimum moistureproofing for electronic components. This movable membrane compensates for pressure fluctuations such as those resulting from rapid temperature changes. The housing is hermetically sealed and has no problem withstanding even highly dynamic temperature changes from -40 °C to +70 °C, so even monsoon rains no longer present a problem. Electronics with IP69K degree of protection The electronics themselves are also dustproof and resistant to high-pressure cleaners, complying with the requirements for IP69K, a high degree of protection. In RadiCal DC centrifugal fans, the EC external rotor motor is integrated in the impeller. Their compact design makes them suitable for installation in even the tightest spaces. The impeller forms a perfectly functioning unit together with the aerodynamically adapted inlet ring. Installation and connection could not be easier thanks to plug & play. The speed can be smoothly controlled with a 0-10 V signal. Electronic commutation and the stator design ensure low-noise magnetization with a high, acoustically imperceptible cycle frequency. Important for mobile communication RadiCal DC fans are used in the base stations that enable mobile communication all over the world. The fans keep the electronics at a steady low temperature and ensure reliable heat dissipation, minimizing the risk of component failure and extending system service life. They are also used in control cabinets and in IT hardware such as networks and storage systems, where they cool servers and routers. RadiCal DC fans are available in sizes from 190 to 280 mm.