"Refrigerator Air Filters are a key component for neutralizing odors and ensuring a fresh stream of air into your refrigerator. Like water filters, your refrigerator air filter should be changed every 6 months depending on usage. Always check your owner’s manual for changing your refrigerator air filter which varies from manufacturer to manufacturer.
If you do not currently use the Refrigerator Fresh Flow Refrigerator Air Filter, then you are missing out on a great way to take preventative action against odors and bacteria. Certified for use with many major brand refrigerators, the Fresh Flow filter will also keep your food fresher for a longer period of time. It is recommended you change the Fresh Flow air filter every six months for peak performance."
Granted, this information comes from a website that sells filters.
