Product review (4 stars): Needs better drawings and documentation but it is an awesome product.
Given that range hood inserts are suppose to be for custom applications you would think they would supply some very detailed drawing about it shape and size. I had a really hard time determining if this unit would fit inside my 1950s Boan hood with the ski slope front.....and it doesn't :( but it is close enough:).

This the technical specs for this unit blows away the competition in this price range and so far it has performed like a champ and is quoeter than I expected. Better documetation would get it 5-stars from me.