... bolt connecting.Exhaust Air System2.2kw pipe explosion-proof axial flow fan for exhaust air.Control systemPowder switch,emergencyswitch,light ... System Paper filter,glass wool filter Lighting Philips tube two units,36w each. Electric Cables All covered by PVC ... bolt connecting.Exhaust Air System2.2kw pipe explosion-proof axial flow fan for exhaust air.Control systemPowder switch,emergencyswitch,light ...