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MERV ratings range from 1 â 16 and measurements are in microns. Some of the common particles related to MERV ratings are pet dander, insecticide dust, smog, dust, viruses, wood, tobacco smoke, spores, bacteria and pollen. Some of the most common filters found in residential use only have a merv rating of 1 to 4.
Find the best balance of airflow and efficient filtration. A high-efficiency furnace filter can slow airflow too much, but low-efficiency filters don't filter dust very well. Get a better understanding of the issues and learn how to find the right filter for your furnace.