The air flow in a duct in a house should have a speed faster than 50 ft/ min so that it does not lose heat in the winter or gain heat in the summer before reaching the room. The dining room of a house is to have a flow of 150 cu ft/min to have proper air exchange. What should be the largest duct area going to this room?
Fill in the blank(s) with the appropriate word(s).
3 sq ft
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