product does not fit tight in the register ones i purchased last time were snug these leave a gap for unfiltered air to enter system what i mean is the od is a bit to small
My wife had had severe allergies, sinus congestion, and asthma for years. She has never breathed so well since we started using Filterbuy HVAC filters.
These filters fit perfectly. I have 2 AC units. The units hold 2 20x20x1 filters. I change them every 5 to 6 months. The price is the best. I purchased 8 or 10 filters have enough for several years.