Describe the main areas of the clean room, from least sterile to most, identify their ISO class, and discuss what tasks are performed in each

What will be an ideal response?

Main areas include:
* The ante-area (or anteroom, if a separate room) is an ISO class 8 environment, the least sterile part of the clean room. It is where compounding personnel perform aseptic handwashing and dressing procedures. Also, it is where technicians gather all necessary ingredients and supplies for compounding and perform order entry and labeling.
* The buffer area is an ISO class 7 environment. It is the area where the primary engineering control (PEC) is located.
* The PEC is a device or room that provides an ISO class 5 environment for the exposure of critical sites when compounding sterile products. PECs include laminar airflow workbenches, biological safety cabinets, compounding aseptic isolators, and compounding aseptic containment isolators.