A 21.5x24x1 pleated air filter rated MERV 11. MERV 11 adds pet dander and finer dust to what MERV 8 catches, which is the step most people take when there is an animal in the house. The pleats are what do the work – they multiply the surface area so air keeps moving through as the filter loads up.
Check the size printed on the frame of the filter you are pulling out rather than measuring the slot – nominal size and actual size differ by up to half an inch, and the printed number is the one to match. Filterbuy builds more than 600 sizes, so an odd opening is usually a stock item rather than a custom order.
Filterbuy has manufactured pleated air filters in the United States since 2013, at plants in Alabama, Pennsylvania, Texas and Utah. The company grew out of Talladega Machinery & Supply and employs around a thousand people. This filter is made in the USA.
