Some of HEPA filter units put the carbon behind the HEPA filter, and some put it in front. The Vornado has the carbon as a pre-filter, saving the expensive HEPA portion for particulates. I find I change the carbon filter rather often, and so a four-pack for me is a sensible idea. I absolutely notice when the carbon has loaded with whatever muck is in the air. Then it's time to install a new one, which is not terribly difficult. I'd rather not have the HEPA filter pick up volatile components from the air, so I'd say this pre-filter works very well.Save 24% Off
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