BS ISO 14644-12. Cleanrooms and associated controlled environments. Part 12. Specifications for monitoring air cleanliness by nanoscale particle concentration|Clean rooms, Cleaning, Contamination, Waste handling, Maintenance, Classification systems, Air-distribution systems, Performance testing, Rooms, Air treatment devices, Air cleaning equipment, Access, Installation, Instructions for use, Leak tests, Environmental cleanliness, Qualification approval, Communicable disease control, Design, Environment (working)