I don’t think it works great as when you are searing a steak, and have the vent on high, the smoke comes out the side holes and the kitchen still smokes up and the smoke alarm goes up.  I had a guy cut a hole thru the outside kitchen wall for the air flow to go out.  It’s a bit better, but the fire alarm eventually goes off.  The perforations on the side should not be there because smoke still escapes into the room.  Why have a vent like this, when all it does is pulls up the smoke and just shoots it up and then out the side back into your open kitchen, where your smoke alarm is near by.  So I’m not impressed.