took a bit to get here but a proper fit when it did
The DLXX8310 Lennox Genuine OEM X8310 Expandable Replacement Filter 20x25x5 (1 Pack) was exactly what I had expected. I was originally concerned if the filter was manufactured by Lennox and rated MERV 11. The Technician that did our Annual PPD Heating Maintenance told me that the Atomic Filters filter I gave him to install was Lennox MERV 11 and matched the one in the Lennox Unit. Also, the Technician recommended that I change the filter every 3-months. By the way, I tried to purchase another filter to keep on hand for the next service maintenance, but Atomic Filters was "Sold Out". Hopefully, they will get some more so that I will be ready for my next Annual PPD A/C maintenance.
Does a great job of filtering the incoming furnace air. Fits exactly in the frame. I change mine every 6 months due to my wife allergies
I order all my filters from Atomic Filters. Their prices are always very competitive and shipped in a timely manner.