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If your talking a round duct. Not a good idea, as it will restrict air flow too much, and harm the equipment.
 

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You only gain slightly keeping the 6" take offs/start collars. Best to use the same size start collars/take offs as the pipe will be.

Be careful going to 10" pipe. It will have a much lower velocity, unless you have a lot more air going through it then the current 6" does(as in 3 to 4 times as much air).
 
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