MERV ratings, or the Minimum Efficiency Reporting Values, reflect an air filter's ability to capture particles between 0.3 and 10 microns. The standards go from 0 to 16, with 16 being the maximum ...

A filter that is too small or improperly fitted allows unfiltered air to pass through, causing dust and debris to build up in the HVAC components. The result is decreased airflow, ...