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Given a circular 8" duct you are dealing with an airflow area of about 50 sq/in. You currently have 72 sq/in opening. I haven't seen a picture of your register - some are not as open as others so it is hard for me to know for sure but... with 72 sq/in opening the air would just dribble out. This is fine for a floor vent that is unobstructed by walls and ...

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