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Can 2, 2x12 floor registers run off of 1, 6” supply duct? The floor registers are both on an outside wall underneath windows and they are 4’ apart.
 

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it's not great to split branch lines but can work with small registers like what you have.

the branch line still needs to be sized for the space - it's better to have one standard 10x4, for a 6" instead of two 2x12s.
 
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