The motor is similar to one of these:
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?