I would definitely recommend replacing these filters if you have never done so. I had tons of leaves and debris stuck to my old filters as well as inside the filter box. Now the airflow seems to be much greater and my fan is much quieter. I'm sure the leaves stuck to my filters didn't help get rid of the musty smell I had previously, but these filters really seemed to get rid of all the odors. It didn't take more than 5 minutes to install, so I'll probably change them once a year.
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