ISO 7 as a gown room

Hi all,

I have a question about the requirement of a gown room. Can any gown room be an ISO 7? Are there any regulations against that (ISO, USP)? Currently all our initial (outside to gown) gown rooms are ISO 8, with an ISO 7 for sterile gowning (non sterile to sterile). Any input would be greatly appreciated.

Thanks,
KJ