How is cleanroom air filtration accomplished?
There are two common filtration methods. Both employ HEPA filters. Fan Powered HEPA Filtration uses motorized ceiling-mounted units that filter the air. The units fit neatly into an existing acoustic ceiling grid. This method does not pressurize the room and is the more inexpensive approach. Alternately, banks of HEPA filters can be mounted in air-handling units outside of the cleanroom. Filtered air is pumped to the cleanroom and then returned and circulated through the filter banks. This method typically provides over-pressurization of the room. References • Control of Particulate Contamination in Healthcare Manufacturing, , Barber, Thomas A., Interpharm Press, ISBN 1-57491-072-8 • HEPA Corporation, www.hepa.com. • ISO 14644 Cleanroom Standards (4 documents) • Cleanroom Design, Whyte, W., ISBN 0471 942049.
