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Old 01-16-2012, 12:11 PM   #1
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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.

Ductwork handle smaller unit?

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

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Old 01-16-2012, 03:52 PM   #2
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Floor Register & Boot Size


If you also have central A/C, you want a long throw.

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Old 01-16-2012, 05:26 PM   #3
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Floor Register & Boot Size


Yes, central A/C also. So the 4"x12" is the better way to go?
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Old 01-16-2012, 06:02 PM   #4
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Floor Register & Boot Size


Quote:
Originally Posted by kmachn View Post
Yes, central A/C also. So the 4"x12" is the better way to go?
Yes, it will help with your cooling. it will cause the air to mix better.
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Old 01-16-2012, 07:13 PM   #5
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Floor Register & Boot Size


Once again, thanks for the help beenthere.
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