Product review (3 stars): Bought as a replacement for a 20 years old Nutone.
Bought as a replacement for a 20 years old Nutone.  This is a good low budget unit.  Removal of the 7" knockout on the top was a challenge for me.  One has to be care full not to bend the steel around the knockout.  The stainless steel is a bit flimsy (thin sheet).  The motor and the fan are large, almost half the vertical vent area is covered by the motor, leaving an area of about 19 inches squared for vertical venting. There is a piece of black rectangular plastic that comes with the unit, which is used to block the vent in front of the unit if you are not using it as ductless range hood (for ductless application - you have to buy a special filter).
I used extreme weather HVAC Foil Tape with a maximum hold temp of 260 F to tape the plastic rectangular piece to the front vent from inside of the unit to ensure no fumes are circulated through the front.  If you choose to do this, remove the fan blades and you have easy access from inside to the front vent (do this before you install the unit and connection to electricity) - The area where electricity connection is made is separated from the heat by a metal sheet, which does not provide much protection from heat (similar to my old Nutone and you would think that there have been advances in 20 years).
It is much louder than my old range hood - One of the reasons that I bought this model was reviews by others which mentioned about how quiet it is!  this is not a quit range hood even at low speed - the air flow is good based on two days of use.  I gave it a 3 star rating because of the noise only.