Radiation containment

Perforated metal is used to enclose electrical appliances in order to attenuate the emitted EMI /RFT radiation and to ventilate the appliances at the same time. Test results show that a shielding effectiveness of 40 dB provides 99.000% attenuation of the electromagnetic radiation while a shielding effectiveness of 92 dB – the highest one in the tests – provides 99.997% attenuation.