Product review (4 stars): It is / does what it says it is / does.
I bought this for my recent range hood purchase; the Stainless Steel 30" x 20" Wall Mount Range Hood with 900 CFM from poshaus.

This was a perfect stop gap solution for use with the that hood till I got the duct work in place.

All I can say is, it fit, and did what it was supposed to do.