How often should I change my air cleaner filters?

I can barely see any dirt on the filters, but it will smell a little bad when I turn it on. It hadn't been replaced in 3 years, but it hadn't gone too far.
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1 Answer

Answer :

We change it every year. It may not be, but not a large amount, and as you wrote, there is not much visible sign of when it should be replaced.
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