Aprilaire 401 Pleated Filter Media Non-Upgraded Units MERV 10

The AprilAire 401 MERV 10 air filter was designed and manufactured in the U.S.A. by AprilAire – the leader in indoor air quality solutions, to maximize the performance of your AprilAire air purifier. Fits models: 2400 (MERV 10).

The AprilAire 401 prevents airborne allergens from circulating through the air in your home by trapping common airborne allergens as they pass through the MERV 10 filter including dust, mold spores.

MERV means Minimum Efficiency Reporting Value, it is a number assigned to a filter based on its minimum tested efficiency data at a known test condition. The higher the MERV rating the higher the efficiency the filter media is at catching smaller particles in the air. Please see the attachments below for literature on understanding MERV ratings and how they are determined.