Recent attempts at sealing the ceiling tiles and damp mopping/wiping the floors and walls etc. have had virtually no impact on the particulate monitoring counts in room 169 (OSB bake-oven room) -> Recalling that the particulate count increase roughly coincided in time with the decision to keep the door closed between the bake-oven room and the adjacent vacuum prep lab., I decided to prop open the door and leave it open overnight.  The result was a return to traditional particle counts in both rooms, i.e., a major improvement in the bake-oven room and no change (or a slight improvement) in the vacuum prep. lab -> I'm leaving this door open until overruled by a higher power