The lip was a perfect fit and the remainder recessed into my return air ...
I purchased the merv 13 in this same filter family and it fit my standard 20x25x1 return grill perfectly. The lip was a perfect fit and the remainder recessed into my return air plenum with no issues. My air flow was much improved and I won't have to change these as frequently as 1&#34; filters. Perfect for those who feel their return is under-sized or just want to change filters less often,
Rating: 5 stars