... flow fan for exhaust air.Control systemPowder switch,emergencyswitch,light switch,fan switchFilter systemPaper filter, fiberglass filter. ... capacity:37400m3/h Control System Power switch,emergency switch, light switch,fan switch Filter System Paper filter,glass wool ... flow fan for exhaust air.Control systemPowder switch,emergencyswitch,light switch,fan switcFilter systemPaper filter, fiberglass filter. ...