Product review (5 stars): A good filter if your vent hood is a re-circulation style.
I use these for our stove vent hood. It is not an exhaust vent but a air chamber re-circulation hood.  Although they are not re-washable, they do seem to remove a lot of odors that the standard re-washable vents do not. They usually are good for three to four months depending on what we cook on the stove top. So for the price they are pretty economical for the added odor removal.