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The minimum unobstructed total area of the outside and return air ducts or openings to a forced warm-air furnace shall not be less than _____________________ square inches for each 1000Btu/h output rating.

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1. The minimum unobstructed total area of the outside and return air ducts or openings to a forced warm-air furnace shall not be less than _____________________ square inches for each 1000Btu/h output rating.





 
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