... on top of the roof. 4.Dedust system1, Pre-cleaning sieve Double drum pre-cleaner can effectively clean out light ... the aspiration device,the pre-cleaner is featured with steady operation and good cleaning effect. The capacity range is 10-200t/ ... Natural ventilation vents,Suction Fan,Ventilation Blower,Ventilation channel with net sheets;Ventilation System includes Natural ventilation vents,Suction ...