what is the best merv rating for filters?
The Best Furnace Filters to Buy The choice of which filter to buy for your furnace depends on how much you want to spend, what youâre trying to filter, and how diligent you are about changing the filter. The minimum efficiency reporting value (MERV) scale goes from 1 to 16. Most residential filters range from 4 to 12. Furnace manufacturers prefer the traditional spun fiberglass ac filters (MERV 2) because they filter out enough of the large particles to protect the furnace while providing maximum airflow.