Return Air Duct Design Static Pressure
I am a residential HVAC consultant, selling replacements and add-ons directly to homeowners.
I need some sage advice related to return air design theory / practice to make myself a better consultant.
The training I have been given as it relates to the "Ductulator" is that I should be using a friction / ESP setting of .10 (for both supply and return) However, one of our more seasoned installers recently berated me for being a "wet behind the ears rookie" and then told me I should be using .05 friction when I design or verify the return side of the system.
What say you?
Help me out here-
Both numbers are rules of thumb,neither is correct,.05 is safer,but I would never use it.
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.1" is a joke. Bad rule of thumb. That is seldom correct.
.05" is better, but still just a rule of thumb.
The ductulator is to be used after you find the FR you need using Manual D.