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Step 1: HEPA Filter
It effectively filters more than 70 kinds of harmful substances in the air, including the airborne bacterium, virus, fungal spore, pollen, asbestos, radon decay product, etc. HEPA Filter’s super efficiency is proportional to the surface area.

Step 2: Cold catalyst

Step3: Activated carbon filter

Step 4: Efficient negative ion, efficient sterilization,