The Frigidaire PureAir Ultra Refrigerator Air Filter Cartridge PAULTRA is an OEM part for Frigidaire refrigerators. Positioned within the air filter housing, the cartridge utilizes advanced carbon filtration technology to remove household odors from circulating air passing through the recycling vent system. The filter measures approximate dimensions of 6-1/2" x Width: 4-7/8" and should be changed every 6 months. Causes of reduced performance include gradual saturation of the filter material from trapped particles and molecules over time as specified by the replacement recommendation interval. Symptoms requiring a new cartridge include: Return of odors to refrigerator shelves and compartments Development of musty smells emanating from the ventilation area Reduced airflow effectiveness as pores become blocked Filter material visible wear through handling This OEM Frigidaire part is also compatible with some Kenmore and Maytag models using Frigidaire ventilation components.PAULTRA (AP4482128) replaces 1550533, 241754002, AH2369707, EA2369707, PS2369707.