Interpreting Filter Performance: The meaning behind the terminology of ASHRAE standards 52.1 and 52.2

摘要

Filter selection often is viewed as a relatively minor decision during the design of commercial and industrial HVAC systems. Based on experience from past projects, an air-handling unit serving commercial office space might be provided with a "30-percent filter" or a "2-in. throw-away" filter. Client preference or the space's use may warrant consideration of an additional and higher-efficiency final filter-be it a "cartridge," "bag," "85-percent," or "95-percent" filter. Some applications may warrant a "MERV (Minimum Efficiency Reporting Value) 15"-rated filter. For pharmaceutical manufacturing suites, the issue is not whether there should be a high-efficiency-particulate-air (HEPA) filter, but where the filter should be located. Should it be centralized in the unit, or should it be at the point of air entry into the space?