This document discusses clean room classifications and microorganisms. It provides details on the typical microflora found in clean rooms, which includes skin bacteria like Staphylococcus and environmental bacteria like Bacillus. It also discusses particle counting standards for classifying clean rooms based on ISO and FED-STD-209E standards. The document then provides information about Airtech Equipment, a Singapore company that designs and manufactures customized clean room, bio-safety and operating room equipment for industries like healthcare, laboratories, and semiconductors.