Help With Operating Pressures And Flows In New Residential System - HVAC - DIY Chatroom Home Improvement Forum

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Old 06-30-2010, 11:54 AM   #1
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Help with operating pressures and flows in new residential system

I am an aerospace engineer and have some commercial HVAC experience but limited somewhat on residential. I am building a new system for an old house. I will runn 100% flex for the output and some flex for the returns as well.

1. is there a standard operating plentum pressure for residential systems to target?
2. Does anyone have any flow numbers for flex with a foil liner? I know this stuff is more restrictive than galv but I gotta use it on this install.
3. Is there a general rule of thumb for return sizing? ie, return flow = 120% of output?

My over all plan is to create an output plentum in the attic and add start collars as needed to run the 8 registers. Size has not been determined yet but units are 2.5T which is a shade big for the house but the house leaks and will be added on later...


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Old 07-01-2010, 06:56 AM   #2
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Duct sizing is suppose to be based on system ASP, and TEL of the duct work.

Available Static Pressure.

Total Equivalent Length.


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