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NAFA Guide to Air Filtration – Fifth Edition - Your source for information about air filtration – from the basic principles of filtration and the different types of filtration devices to information about testing, specialized applications and the role of filtration in Indoor Air Quality. The NAFA guide also contains information about industrial finishing, cleanrooms, filtration efficiencies for hospitals and health care facilities and updated information about ASHRAE 52.2 – 2012.