Product review (1 stars): JUNK.  I have had this one for some time.  It never did work.  90 percent of smoke and odor does not go through filters....read.
Filters do not come with this item.  You must buy them separately.  Doesn't matter because very little enters the filters.  Here is why.  In the middle of this is the fan cage.  As it turns, it whips out air the the sides.  This air is actually pushing the fumes away from the filters.  Now in the middle, the fan works correctly.  It draws the fumes up through the filters.  If you are cooking directly under the middle then you get okay results.  But any other burner and it is a big waste.  Here is the test.  Anyone can do it.  Take a paper towel and hold it under the filters about five inches.  Start at far sides of filters.  You will see no pull.  You don't see pull until you get to very center of range hood.  Here are other problems with this.  It isn't designed correctly to pull in from front burners.  Over your front burners is where the lights are.  And the fumes go up and around the lights causing oil leak from bulbs.  Seems dangerous.  The rest goes into your house and it is a big mess.  I have tried about three times to determine what the problem is.  I am finally convinced it is not me.  Unfortunately, I am stuck with this junk until I find another.  This is just another scam.  What I don't understand is how so many here say this is great.  Something is not right with this system.  This product is horrible.