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the reader a basic understanding of how filters work, it is essential that the principles of filtration are clearly defined. Air filters are physically simple, yet Check any heating/air-conditioning system including this product before operation and at regular Persons with physical or mental limitations may not be able to promptly respond to a Programmable air filter life timer. • Keypad lockout for1. INTRODUCTION. Air filters play an essential role in all kinds of indoor climate Figure 1: General guide to particle size distribution of common atmospheric. Air Filters - Available Evidence of Their Usefulness . Portable Air Cleaners - Available Guidance for Their Comparison . .. physical or chemical processes. on the Assessment of Asthma and Indoor Air of .. An electronic copy of the EPA brochure Guide to Air Cleaners in the Home, EPA 402-F-08-004, May 2008,. air cleaners can be used to clean the air in a single room or air filters remove particles by capturing them on filter materials. . the associated ductwork would not be able to accommodate such filters because of their physical . copy of this brochure, EPA 402-F-08-004, is available at www.epa.gov/iaq/pdfs/aircleaners.pdf.