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With the 4″ and 5″ air filters there is a wider variance between the nominal and actual size depending on the manufacturer. Changing your air filter is the first step in insuring your HVAC system runs at its optimal level this season.

With the 4″ and 5″ air filters there is a wider variance between the nominal and actual size depending on the manufacturer. Changing your air filter is the first step in insuring your HVAC system runs at its optimal level this season.