I have not seen any regulation on the number of HEPA filters in a room. Typically, it depends on the number of air changes you intend to have in the clean room; so greater the number of HEPA filters, greater are the air changes.
I have not seen any regulation on the number of HEPA filters in a room. Typically, it depends on the number of air changes you intend to have in the clean room; so greater the number of HEPA filters, greater are the air changes.