German to English Tech/Engineering Medical: Pharmaceuticals

I'm at the end of a long translation on cross-contamination in the pharmaceutical industry. I now have a floor plan/layout to translate with labels of names of rooms and areas e.g. mixing room, tablet production, weighing etc.

There is one area labelled Blas-schleuse (hyphen may me for space). There are other 'locks' i.e. machine lock, but I'm stuck on this one. I though of 'air lock' but that is 'Luft schleuse' I think.

Any help appreciated.

Sorry no more context as not within a sentence, just a label.