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That depends on the size of each room and how many registers are in each room. For example. If you have 600 sqft of space you are looking at around 1 ton of needed cooling. For that 1 ton you will need appx 400 cfm total for it to operate properly. If you have 4 registers, that`s 100 apiece. If you have less registers each one will deliver more cfm, more registers less cfm per register.

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Q: What is minimum cfm out of each ac register on a central system?
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