These filters are true to size and fit perfectly in my ceiling vents. I have to change 5 filters every time and having them shipped to my home in bulk works great. I have found that a MERV of 8 is ideal for most homes. Anything lower won't filter as much, and anything over 8 can make your heating/cooling system too heavy and not as efficient. If anyone else knows, please report. This is just information I have gathered while researching the meaning of MERV. I will buy them in the sizes I need until they get out of my comfort zone.
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