As i understand it, CFM is the amount of air moving and velocity is the speed the air is moving. As it concerns to ducting, Is it possible to increase CFM without affecting the velocity by changing the duct size? Does length of ducting affect either? Will a mile long duct have the same CFM and velocity as a 10 foot run? I'm asking because i hired someone to do my ducts, he did a report based on my house and came up with how many CFM each room need. At one point in the diagram the duct diam. goes from 7in down to 4in for a few feet and then back up to 7in. I'm guessing this had something to do with velocity. I'm trying to understand if this is correct and if it is why. Thanks for being patient with me.
source https://hvac-talk.com/vbb/showthread.php?2226489-The-relationship-of-CFM-and-Velocity-in-ducting&goto=newpost
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