I want to buy 4400 for carrier furnace mvb 080-20, actually most furnace dimensions are quite close, this filter has 3 sizes, close but not well fit. I really don't understand why Aprilaire uses wide grill at the side near the front, which reduces the furnace return area, this compliant to what I said: most designers are stupid.Honeywell F300E doesn't have this drawback, yet over priced.
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