Changing room design standard

Hi all, do you guys know are there any BRC/FSSC standard requirements for clean hygiene room/changing room design.
Recently I had a project to upgrade the room isit a must to install air shower chamber/boot washing machine. Is there any equipment needed and what is the correct flow for the clean room ?

There is a brief outline in section 4.8 of the BRC standard, a bit more detail added in the corresponding section of the Interpretation Guide, but as with many BRC elements these are fairly generic and broad - it's largely up to the site to determine and justify what is appropriate for their operation and risk levels.

Boot washing definitely isn't a general "must", because there are sites for which it isn't necessary ;)

If you want more specific guidance then please advise what type of activities / products you're manufacturing.