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How standard? The hardware store products are fundamentally pretty poor because they’re at most 2” deep. But Aprilaire, Lennox and some others have nice 4” fi
by amluto 4y ago
How standard? The hardware store products are fundamentally pretty poor because they’re at most 2” deep. But Aprilaire, Lennox and some others have nice 4” filters at reasonable prices.
- tguvot 4y ago4" is standard. plenty on amazon and other places. hardware stores don't usually carry it because people probably don't understand that 4" is better from one side, and from the other not all filter boxes/supplies can accommodate > 1"