Cleanroom environments are a demanding field of work at the leading edge of technological progress, with fresh challenges continually being encountered. Wherever minimised production tolerances and maximised dependability have to be guaranteed, cleanroom engineering often makes a crucial contribution. The applications range from developing and manufacturing highly integrated semiconductor memory components and micro/mega-chips or compact disk production to assembling precision-engineered drive systems and devices for spacecraft. Keeping harmful germs and particles well away from the production process is particularly important in the chemical and pharmaceutical industries, where sensitive medicines and additives are involved. Moreover the contamination of both neighbouring areas and the environment with particles and germs must also be avoided. Viledon EPA/ HEPA/ ULPA filters offer effective protection for sensitive products, by arresting almost 100% of the critical particles in the intake and recirculated air flows. To extend the useful lifetime of these EPA/ HEPA/ ULPA filters, Viledon pocket filters and MaxiPleat or NanoPleat cassette filters are used in the prefiltration stages.
Hygiene in healthcare facilities
Requirements for ventilation and air-conditioning systems and units
EN 1822 and ISO 29463 for EPA, HEPA and ULPA filters
Where the highest standards of air purity are required – for example in cleanrooms in the pharmaceutical and food industries and in operating rooms in hospitals – EPA, HEPA and ULPA filters are used. In Europe, these filters are subject to classification according to EN 1822 for filtration efficiency and zero leakage. HEPA and ULPA filters are also subject to individual tests. The international standard ISO 29463 is based on European standard EN 1822 and will probably replace this standard in the future. Both standards are based on the latest particle counting methods.