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Converting Duct Area to Square Feet

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What's a CIM? Hint:
CFM = Area x Velocity.
CIM is Cubic Inches per Minute. Typically, it's a huge number that you get when traversing a duct and calculating CFM, but you forget to divide the area of the duct by 144 to convert square inches to square feet.
To save you some time when traversing a duct...

 


 

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