I am pleased with my atomic filters. I might add, in the past, 12x24x1 filters from Home Depot, Lowes or Ace Hardware, fit snuggly. Therefore I assumed my return required a 12x24x1 filter. To my surprise, The Atomic filter fit was very tight. When I then measured the return vent, it was less than 12x24x1. I intend to replace the hex head screws which mounted the vent, with flat head screws. This will give me a little slack. Won't know if its enough until I replace the screws. I had used fibreglass filters in the past. I'm certain these new Atomics will filter much better being as they are the pleated variety. I'll be back when the need arises.
Happy to review for you. Al