Cencal Mechanical Heating & Air Inc.

The minimum efficiency reporting value (MERV) is a rating that describes how well an air filter removes impurities. These values range from 1 to 20. The higher the value, the higher the quality of the air passing through the filter.

Ratings are determined by measuring the size (in microns) of the smallest particles that can pass through the filter. The highest-rated air filters are also the most efficient.

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