Quote:
Originally Posted by jrref
Yes I found the same. With my new Carrier Infinity system they installed a Toptech filter cabinet that takes 20x20x4 filters but only their filter fits perfectly. Others are either slightly smaller or too big. I always find it interesting that all the systems come with a 1 inch filter as standard with the system.
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I had a new carrier furnace/AC installed which has the toptech filter cabinet and honestly, it kind of torqued me off when I found out it's proprietary. Had I known that in advance I would've seriously considered a different brand. I replaced two other furnaces in previous houses and was always able to use filters from retail stores.