Floor Register & Boot Size
I am upgrading the ductwork on my home since we hope to install a smaller unit after finishing energy efficiency upgrades. Some of the details regarding the Manual D can be found on this thread.
My question has to do with the size of the boot, and ultimately the type of register. Specifically, we are upgrading 4 current 6" ducts to 7" ducts. According to Manual D, they will deliver approximately as follows:
7" Round Sheet Metal Ducts
#1-117 CFM - Cathedral Ceiling
#2-112 CFM - Cathedral Ceiling
#3-134 CFM - 9' ceiling
#4-134 CFM - 9' ceiling
My question is, what parameters should I use to determine the boot & register size? The grill we will most likely use are the Hart & Cooley #411, so I am not sure if I should install 4"x12" boots or 6"x10" boots.
According to the engineering data for the #411..
-the 4"x12" will have a face velocity of ~550-650FPM with 9'-11' throw.
-the 6"x10" will have a face velocity of ~450-550FPM with 5'-6' throw.
Am I looking at this correctly, and would one of these sizes be preferable to another? Would it be better to use a register other than the H&C #411? We live in the midwest (St. Louis area) so our heat pump gets more of a workout than the A/C, but we also use alternative heat sources (i.e. wood) in the winter to assist in very cold weather. Not sure if that makes a difference, thanks
If you also have central A/C, you want a long throw.
Yes, central A/C also. So the 4"x12" is the better way to go?
Once again, thanks for the help beenthere.
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