Quote:
Originally Posted by retiredguy123
I have never seen a 1-inch filter on a Carrier unit except maybe in the manufactured houses on the north side. My Carrier unit uses a 4-inch thick filter and I have never used a Carrier filter. I buy "Filterbuy" filters from Amazon and they always fit just fine. Also, I have found that the MERV 11 filters make the house quieter and less dusty, and they do not negatively affect the AC system. Another choice is the Flanders filters sold at ACE Hardware, but I prefer to buy them from Amazon.
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On the newer circa 2020 and newer, furnaces and air handlers from the carrier factory only have the 1 inch filter bay. Most HVAC companies upgrade these with a 4 inch filter cabinet. But as you are mentioning the older carrier systems did have the 4 inch filter bay with that crappy hinged door.