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#global-footer .cr-footer--outer-wrapper { display: block; } #global-footer .footer--buttons .crux-btn.footer--donate { display: none; } @media only screen and (max-width: 767px) { #global-footer .cr-footer--col ul { display: block; } }

How to Clean an Air Purifier

02:20

Whether an air purifier has a replaceable HEPA filter, a permanent filter or a combination of both, they all need regular upkeep. CR walks you through taking care of several different types.

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