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Looking for a little guidance. I have 3 small offices and one has really poor air circulation. I was interested in splicing into the existing flexible duct work and add a register. Is this the best possible approach? Also, is it as simple as cutting into existing duct and applying a "T"?
 

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Very poor practice to take another run off of another flex run, neither one works then. Go all the way back to the trunk line and take it from there.
 

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Won't really get you more air flow, just takes away from the other supply. best to tap into the main trunk and run a new supply. Or increase the size of the existing one.
 
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