Honeywell POPUP2400 is a 2-pack of 16" x 27 1/8" x 5 7/8" pop-up air filters with a MERV 11 rating. These pleated filters are designed to fit in standard air ducts and help to improve indoor air quality by removing dust, pollen, and other airborne particles. The filters are made by Honeywell, a trusted brand in the home improvement industry.