Review on 🔍 Nordic Pure MERV 12 Honeywell/Lennox Replacement AC Furnace Air Filters - 20x20x5 - 2 Pack by Rusty Calcara

It was difficult to ensure I got the correct Lenox Air Purifier Filter Box replacement. While the nominal size is 20 x 20 x 5, the actual size is 19.88 x 19.63 x 4.38. Note that it's not square and the larger size corresponds to the width, while the slightly smaller corresponds to the depth (front to back when you put it in). If you move it 90 degrees the wrong way it will be crushed when you try to push in the fairing as I found my installer installed the original filter.)