What are the filters made of?

• The Pre-filter is a Polyethylene (PE) sponge filter.
• The Carbon/VOC filter is a blend of Activated Carbon with Potassium Permanganate on Zeolite in a paper frame. (The Zeolite used in AirDoctor is a high-purity naturally occurring Zeolite that is not carcinogenic.)
• The UltraHEPA filter is made of pleated-glass micro-fiber paper in a plastic frame.

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