Cooker hood with extractor fan but there doesn't seem to be much
extraction.

The motor is similar to one of these:

https://www.luxairhoods.com/cooker-h...er-hood-motors

There are three filter sections to the hood and if I hold them up to
the light I can see quite clearly through them all but if I put a
small tissue against even on full it will barely hold.

If I wet my finger and put it near the motor it almost feels as if
more air is on the motor side pushing out than on the other side of my
finger being drawn in. Yet the flap on the extractor exit outside
does open so somethings getting out.

Are they inherently inefficient? Or am I expecting too much? Any
clues to actually get kitchen smells to exit?

--
AnthonyL