Product review (2 stars): Full size filtration was the selling point. To bad it does not exhaust properly.
The hood is very nice, however it does not perform the function which it is designed for; that being exhausting smoke and odors to the outside of the building. There is an engineering or manufacturing flaw which causes turbulence in the plenum; as much air blows around and back through thru the filters as what goes out the vent pipe. You can see the smoke go into the right side filter, while the smoke on the left side gets blown away from left side filter. My duct pipe is clear, dampers opened and the axial blade has the correct rotation, even opening a window for make up air has no effect. I would advise performing a smoke test before permanently installing. Less than half the smoke gets exhausted. I will have to try a propeller type of blade or change the  plenum to a round outlet instead if a 3"X10" discharge, and have the new blade inside the duct. I have been an Air Conditioning contractor for 40 years, and also a Mechanical Inspector for 15 years. One way or another I will have to make this hood work.