Duct work?

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Duct work?

Postby amberteresa on Sun Aug 12, 2018 9:50 pm

i am currently remodeling my bathroom on second floor. while in the process id like to run heat up to 3rd floor bedroom above bath. I have easy access to get it up, but have questions if heat will work efficiently. the current duct size is 4x10 or 40 square inches. i have been told by some that i need to use half of the square inches or 60 % . is this true will i still get good heat to both if i use half on each run?
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