We are offering auto viscous filters used as pre collector in ventilation applications where surrounding atmosphere is very dusty such as in cement and steel industries models ::9 to 40(s) in direct indirect drive arrangement sizes : 7,000 m3hr to 35,000 m3hr capacity air conveyacne ductings and dampers air conveyance ducting in gi and ms construction in round rectangular configuration for air ventilation as well as air pollution control applications.