Actual Size: 11.75 x 23.75 x 4.38. Our (Accumulair brand) 12x24 Honeywell FC40R1037 compatible return air grille filter is specifically built to substitute for the OEM FC40R1037 return air filter specification. Preassembled; no assembly required. Notice: Example filter picture shown is not to scale and is shown for lip style purposes only. *Name brands and FC40R1037 part number are listed for filter style identification. Catalog and FC40R1037 variations last updated on 03/22/2020.
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