The FreshFlow Refrigerator Air Filter is an OEM component for Whirlpool and Maytag refrigerators. Located inside the ventilation system, this filter purifies circulated air. This air filter is 3" wide by 2" high and white in color. It should be replaced every 6 months to ensure the best performance. Causes of failure relate to clogging from trapped dust, dander and other allergens despite regular replacement intervals. Performance decreases as filter media becomes saturated over months of use.   Symptoms of a dirty or blocked refrigerator air filter include: Reduced airflow causes higher compressor runtime hours   Odors being pulled into the fridge from unfiltered vents   Shortening of food storage life due to unpurified air exposure Reduced fan speeds or strange noises originating from the vents This genuine Whirlpool filter is also compatible with Maytag, Jenn-Air, and Amana models as well.W10311524 (AP4538127) replaces 1876318, 2319308, AH2580853, AIR 1, AIR1, EA2580853, PS2580853, W10315189, W10335147.