Dave
I'm not sure about web addresses but I am doing a similar job myself and wish to do a code compliance check.
So far the regulations I can point you towards are:-
- European Annex to GMP '97
- BS5295 Part 1:1976 environmental cleanliness in enclosed spaces - definition of air quality categories
- the quality assurance of aseptic preparation services, NHS
- rules and guidance for pharmaceutical manufacturers and distributors 1997 MCA
- HEPA filter efficiency to 99.97% at 0.3 microns typically for grade D or class 100,000 clean room. (US Federal Standard 209E)
US standards are available on line to download and BS's probably are.
Hope this is some help
Regards
John in Sligo