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I'm replacing central AC. My new evaporator coil is little higher than the old one, and now the new one is blocking two flare takeoffs by 50 square inch, one takeoff duct is transfer 14x12 (168) to 14x10  and other 18x12 (216) to 18x10. Do I have to alter the takeoff for those 50sq inch or it will not affect the airflow?