A less expensive alternative to 3M, Endust furnace filters come in two types, with MERV ratings of 8 and 11.
MERV stands for Minimum Efficiency Reporting Value. It is a number from a test method designed by the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE). The number is intended to help people compare filters. Generally speaking, a higher MERV rating indicates better filter performance.
To learn more about selecting and replacing a furnace filter, please visit our Furnace Filters Information Page.