This is deflection kit so that **some types** of Siemens kitchen extractor can filter and deflect clean air back into the kitchen rather than have a hole in the wall.
See https://www.siemens-home.bsh-group.com/ae/supportdetail/product/LZ52750((URL removed))
Totally unused.
Siemens LZ52750 (Kidlington OX5)
This offer has been gifted to someone and is no longer available.