Our electronic filter unit failed, so mechanical filters were needed for the first time in decades. I guess standards changed because we could not find the correct size anywhere. So glad to have discovered Filterbuy.
Received my filters (3 packs) in a neat box. As soon as I install it I notice that the air comes out clean, fresh-crisp and Im no longer feel pain in my throat (have allergy case). Thats where I know that it works well. However I dont find out easy to cut the frame for disposal as my health is more important than trying to manage the disposal with the risk of breathing the dust thats stack on the filter.