Hepa is held to a higher standard...think of it like a coffee filter. If you made coffee with a piece of screening (like a screen door) that'd be like a regular filtre...it'll only catch the big stuff. Now think of a hepa filter like using 2 regular coffee filters...it'll filter out more of the smaller bits.
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Purifier Austin Air HealthMate Jr. HM 200 Blue, New in Box HEPA Filter Air
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Purifier Austin Air HealthMate HM 400 Black, New in Box HEPA Filter Air
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