Ducting Advise - http://www.hvacmechanic.com/ Forums
Original message
| FesGeek
 |  "Ducting Advise"
, posted Wed 11 Jun 21:27  
Hey all,
Hoping to get a little advise on what is needed for setting up my workshop with central air. I already have the unit, but need advise on the size ducting and how many runs I need.
The shop is 24'x24' with a 9' high ceiling. There are no interior walls and have full access to the attic above.
If you need the model numbers off the outside unit, blower, and condenser coil...I will get them.
I appreciate the help in advance!
--Jason
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Replies:
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| theduke03
| "Re(1):Ducting Advise" , posted Wed 11 Jun 21:33
Model# of condensing unit?
"My dad was the most feared furnace fighter in Northern Indiana."
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| | FesGeek
| "Re(2):Ducting Advise" , posted Wed 11 Jun 21:57
Outside Unit: Carrier 38CKC030340
Inside Evaporating Coil: CAC/BDP CK3BXA036017AAAA
Inside Blower/Heat: Carrier 58STA070---10112
Thanks,
Jason
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| | Freon
| "Re(3):Ducting Advise" , posted Thu 12 Jun 15:12
You have a 3 ton condenser and will need ~1,200 cubic feet per minuite of air flow through your duct system. Research ducts and you will learn how big a duct will carry how many cfm of air. eg... a 6" round metal duct will carry ~120 cfm. So in your place, assuming the 6" duct is used to supply all the supply registers, you'd need 10. But duct systems taper... at the supply plenum will be the biggest sized duct. As you take air away to supply registers, you will also reduce the size of the main trunk.
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