7 March 2012Enclosures, Racks, Cabinets & Panel Products
EMC (electromagnetic compatibility) enclosures that have high HF (high-frequency) shielding need to be air conditioned by fan-and-filter units, and in this case special EMC units should be used. The new range from Rittal now offers improved shielding or attenuation of electromagnetic fields and thus higher EMC safety.
The new development, which has the advantages of the TopTherm fan-and-filter unit series, such as high pressure stability and easy mounting, meets the requirements of performance category 2 for screening attenuation according to EN61587-3:2006 in the frequency range of 30 to 1000 MHz.
What is new is that the entire fan unit – consisting of housing and filter mat – is designed for optimal EMC protection. Although until now special EMC wire gratings were necessary for shielding, users can do without them with the new units. Rittal achieves improved shielding by means of metallised surfaces, both of the filter housings as well as of the filter mats, with copper-nickel-chrome coatings. The EMC fan-and-filter units thus establish a minimum attenuation of 40 dB for the frequency range of 30 to 230 MHz and 30 dB for the frequency range of 230 to 1000 MHz.
The fan-and-filter units can be clipped into the corresponding mounting cut-out on the enclosure or housing and bolted down. Attachment of a self-adhesive circumferential contact film additionally ensures reliable and comprehensive securing of the fan-and-filter unit to the inside of the enclosure or housing.
Like the current TopTherm fan-and-filter unit series from Rittal, the new EMC units also have a high-pressure diagonal fan technology – a synthesis of radial and axial fan technology – and a fan output range of 20 to 900 m³/h. By default, the protection categories range from IP51 to IP54.
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