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Old 11-22-2011, 08:07 PM   #1
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HVAC-Calc Trunk Size


I have run HVAC Calc and get it all but duct sizing
so far this site has been a great help
Can anyone help me with this diagram
I understand the branch sizing and the split returns

but the Trunk is got me stuck

see attachment

I forgot to mention all duct is PVC and Under Slab
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HVAC-Calc Trunk Size-duct-layout-001.jpg  

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Last edited by BSB00; 11-22-2011 at 08:31 PM. Reason: Forget
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Old 11-23-2011, 08:56 AM   #2
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HVAC-Calc Trunk Size


First may I start with a question of why your going under slab with the duct?
When you say PVC are you talking about PVC coated metal or Sch. 40 PVC pipe.
Im not absolutely sure but I think using PVC pipe is illegal.

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Old 11-23-2011, 05:49 PM   #3
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HVAC-Calc Trunk Size


Your next to last branch/supply will be your longest supply run. So what is that total length?

Also, the supply you have coming off the end. Don't do it. make it come off the trunk a foot or 2 back from the end, or you have a noise problem there, along with it being hard to control how much air comes out of it.
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Old 11-24-2011, 07:16 PM   #4
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HVAC-Calc Trunk Size


Total lenght is the lenght of the supply duct plus the next to the last longest branch??

This where I get really confused reading manual D
On the Trunk and reductions

The long side of the supply is 45 feet with a 45 degree bend then 35 feet
the short side is 35 feet straight run all branch planned on 6 inch or 4 inch by cfm shown

PVC is legal as long as it is encased/dirt or concrete



Thanking in advance Brian
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Old 11-24-2011, 07:42 PM   #5
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HVAC-Calc Trunk Size


You probably have a total equivalent length of 295 foot.

The supplies are sized by the same friction rate that the supply trunk is sized by.
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