Product review (4 stars): Gets the job done while letting the air flow.
Bought this to fit behind a&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Universal-Metal-Industries-Exhaust-Fan-Grill/dp/B0002Z1GYC/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Universal Metal Industries Exhaust Fan Grill</a>, which it does perfectly. The filter is about as expected; fairly thin but does the job. It doesn't have a very tight mesh, so I don't think it does the greatest job of filtering, but at the same time does catch a decent amount of grease and doesn't seem to impede the airflow too much. They are about as thick as a piece of Amazon's typical shipping cardboard box.