Thanks for all the replies..
for me it means the following:
If the packaged product is heat-treated in an inedible casing / packaging, e.g. ham, then it goes through showering and cold storage in the given package, and then it is unpacked and cut at the packing room, and then it is packed here in this room, e.g. into consumer packaging, and in the shower room and in the cold store, there does not need to be positive pressure or microbiological air filtration. Otherwise - it must be .
Ensuring a positive overpressure of air will probably be a big problem, because it fails due to several factors, one of them is certainly the size of the openings through which products and materials are moved to and from the room with HRA - I understand