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  Filtering recirculating air in residential heating & air conditioning systems serves mainly two purposes. One is the prevention of dirt accumulation on components like evaporator coils to maintain a good efficiency / low energy consumption rate.

The other benefit is the cleaning of the air from dust, allergens and irritating substances. Filters with high efficiencies usually have a tighter filter media which increases the flow resistance. While the filter is collecting more dust, the resistance increases even more, and the air volume (cfm = cubic feet per minute) decreases. High efficiency filters should be changed more often. Some filters use a MERV classification to rate it's efficiency. Common ratings are between 8 and 12, with MERV 12 being the most efficient filter.

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