Recirculating downdraft extractor

Sandtree

Does anyone have any experience fitting a downdraft extractor fan on a recirculation basis? Particularly the type that go in the voids rather than requiring cutouts in the cabinet?

In principle it seems relatively simple but struggling to get my head round how you actually do it in practice and YouTube only shows stylised animations which really don't cover the practicalities... seems like I need to start at the plinth, build up from there to where the hob will be, put the cabinet in place then drop the hob in and connect up. Only a short plinth run so it'd be doable but others must be doing it another way if the hob it in the middle of a longer run.

Any experience would be appreciated

Sandtree

Should I be worried no one has or have people all paid someone else to install them?

Sandtree

So the answer is... absolutely!

No meaningful instructions, no practical guides... managed to sort it given it was a single unit, can see how it would work for an island or dual unit peninsula but no idea how you'd do it otherwise.

That said, seems to work surprisingly well