Cleanroom Design FAQs: Too High of Classification
Question: Is there a problem with building a higher classification clean room than needed?
Every time you go down a class, or up a class, for instance from an ISO 8 (class 100,000) to an ISO 7 (class 10,000), that’s going to take twice as much air. The cost of filtering and moving air is a significant cost of operating a clean room. This process translates all the way down through to the number of filters that you need, the amount of return air space that you need, the amount of air conditioning you need to cool that return air and so forth. And this multiplies itself as you go through the process.
What would seem to be a simple difference (moving from one class to the other) significantly changes the cost of the cleanroom, almost 25% for the same sized cleanroom at the same classification.