SIR I HAVE BEEN WORKING IN MAJOR CEMENT PLANT IN GUJARAT INDIA I WANTS TO KNOW THAT WHAT MAJOR EFFECT MAY OCUUR IN ABSENCE OF PH DUCT,WHERE I HAVE BEEN WORKING THERE IS ACCIDENTLY PROBLEM CAME AND PH DUCT FALLEN ACCIDENTLY NOW OUR PLANT IS RUNNING IN PC DUCT ONLY WITH USE OF BOTH PH AND PC FAN, OUR PLANT CAPACITY IS 4200MT IN PER DAY IN THIS CONDITION IT GIVES 3500PER DAY PL REPLY ME MY MAIL ADRESS IS mamothia@rediffmail.com with regards thanks mothia