Do support YM CEMS with Mr. Hannes and Mr. .Adrianus. Clean up Flowsic 100 complete unit also filter purge air unit. Bring down Dust Hunter T100 check zero adjust result value zero without materials 1.2 mg/m3 recheck function of swivel windows result replace swivel windows with spare units install back Dust Hunter at stack result value dust 4 until 5 mg/m3 ( RIZAL & ANDRI & HANNES KISS & ADRIANUS KISS )