... System- A Primary Filter* 1set, filtering rate > 83%- B Air-Intake Filter* 1set, 600G high efficiency filter (ceiling filter) - ... floor filter (fiberglass filter), filtering rate > 70%5. Air circulation System- Air-Intake Fan* 1unit, Centrifugal Fan with 4kw motor, 2 sets ... ,air capacity 25000m3/h in total. - Air-Exhaust Fan* ...