just installed cts9004 two weeks ago and so far so good. 3 levels of exhaust fan speed and noisy if I am using the level 3 (max) speed. I was using internal circulation hood previously and after changing to this, yes I can see the improvement as my floor doesn't have the oily stain after cooking and my mosquito netting is still clean. My kitchen does not have any exhaust fan and depends on this CTS9004 to recirculate the air; and it is effective as the kitchen temperature stays constant and, the cooking smell is not that significant compare to my previous hood.

not sure if this helps

If condo management allow, can drill hole and put the duct. The smoke will be suck to outside.

Fotile only model with recirculating (recycle hood) is EH13 - R