CMHC: Overview On Furnace Filters CMHC information sheet helps to understand and choose from the multiple types of filters available, based on their abilities to stop different kinds and sizes of particles. (PDF)
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US EPA: Summary Of Residential Air Cleaning Devices US Environmental Protection Agency covers pollutant types, air cleaning strategies, types of air cleaners, effectiveness, health effects, installation, use, maintenance, guidelines for comparing, and references. (PDF)
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