... 1set, filtering rate > 83%- B Air-Intake Filter* 1set, 600G high efficiency ... Air circulation System- Air-Intake Fan* 1unit, Centrifugal Fan with 4kw motor, 2 sets,air capacity 25000m3/h in total. - Air-Exhaust Fan* 1unit, Centrifugal Fan ... with 4kw motor, one set,air ...