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Just to clarify, cooling load @22,000 heating load @68,000. If only installing air handler with 2 ton coil would size for 800 cfm. Since furnace indicates blower is 1200 cfm, not sure if ductwork...

Should ductwork be sized to furnace or a/c. New 80k 90% gas furnace has 2, 2 1/2, 3 ton blower. Two ton a/c needs 800 cfm, furnace tag indicates blower is 1200cfm? should duct be sized for 1200 or...