Joe and I continued to clear out the photolab and to clean up the cleanroom.
In the clean room we inserted the new ceiling tiles that have arrived 2 weeks ago.

My concern were the build-in AC's in the cleanroom acting as the biggest source of pollution  ...
so we opened the AC front panel and took a look inside ... after vacuuming the inside we
certainly want to insert air filters in the air boxes.
Then we started to get rid of the spider webs/nests we found in the electronics racks, 
oscilloscope carts etc ... yuck.

.