“The 3 stage model has a pre-filter, H13 filter, and a carbon filter. I assume the stage 4 model has these three, but what is the fourth stage? What situation would the 4 stage model be most useful for? I've been using the 3 stage model in the past.”

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• The 4-stage Filtration system includes an outer pre-filter, inner pre-filter, HEPA filter, and carbon filter. The Outer pre-filter traps dust hair, lint, fibers, and pet fur while the inner pre-filter features electrostatic material that protects the other filters and helps the air purifier work more efficiently.

  Answered by Etekcity-Cosori-Levoit 2 years ago

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