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03-09-2005, 10:07 AM #1
I have a duct calculator and have researched the internet but can't find any reference to register size. The house I'm working on had 2"x12" registers in all rooms even the ones supplied with 8" duct. I've replaced them with 4"x12" in all rooms except the bath rooms. How do you size registers to be matched to sq. ft. and duct size?