4-Pack Replacement Whirlpool WRF991BOOM01 Refrigerator Air Filter - Compatible Whirlpool W10311524, AIR1 Fridge Air Filter Replacement Whirlpool WRF991BOOM01 Refrigerator Air Filter, Quantity: 4 Replacement Whirlpool WRF991BOOM01 Refrigerator Air Filter Activated carbon air filter reduces odors and freshens the air inside your refrigerator. Helps prevent odor cros-contamination of food. For best performance, replace the filter every 6 months. On Sale for a Limited Time!