My unit requires a Merv8 filter measuring 19x20x4.5. I used to buy them at Ace Hardware but there was a little play in them when installed. My HVAC people said that is not a good thing. They recommended Home Depot for the Merv8. I tried theirs and they fit perfectly. They are less than $30, but could last up to one year. I replace them every 6 to 8 months.
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