Construction
CFM Per Room Calculator
Total system CFM split per room by load percentage. Use this to size each register and damper.
Room CFM
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- % of system
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- Register count
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- Approx grille size
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FAQ
CFM per register? +
Residential supply registers handle 80-150 CFM each. Bigger rooms get multiple registers, not bigger ones.
Returns vs supplies? +
Returns should equal supplies. Each bedroom needs either a dedicated return or a transfer grille / jumper duct.