During filter integrity test DOP/PAO upsteam concentration not achieving for terminal filters by keeping generator at AHU’s prefilter…please share some solution…!!!
Your AHU should have a built-in port at the terminal filter hosing. You should insert you areosol into this port (upstream) and and measure the particles across the face of the filter by scanning.
i agree with Mr.Jay,
but as per the guideline while checking the down stream concentration, again upstream concentration is to be checked in between.