Suspended from the ceiling, these types of cleanrooms are easily expanded or shrunk as needed over time.
The flexibility of hanging the cleanroom from the ceiling joists is that you can always make changes to your cleanroom(s) as needed.
Ceiling Suspended Softwall Cleanrooms are easy are modular, easily being changed in dimensions over time.
Take for example a manufacturer of precision optical lenses for a defense application that is plagued with dirt particles large enough to see with the naked eye. The particulates range in size from about 15-30 microns and number in the range of 5,000-7,000 per cubic foot. Utilizing the Clean Room Classification Chart, they can see that they would require an ISO6, Class 1,000 room to reduce the number of 15-30 micron particles to under 10 per cubic foot.