The Question posed on LinkedIn.

“Please let me guide or give recommendations, what will be grade of change room just opening in Aseptic filling area. Please mention reference also.”

My advice:

PE 009-12 (Annexes) 2015.

Annex 1 states:
“Changing rooms should be designed as airlocks and used to provide physical separation of the different stages of changing and so minimise microbial and particulate contamination of protective clothing. They should be flushed effectively with filtered air. The final stage of the changing room should, in the at-rest state, be the same grade as the area into which it leads.”

So, what Grade is the filling facility? That is the grade you should validate your changing room/airlock to be.

A google search will find you the relevant PIC/S PDF.

Followup comment

You can download all the PIC/S documentation here: http://www.picscheme.org/publication.php