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I would like to know ,do I use a 6" insulated duct to a 6" register?

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  • There are also circular registers for walls depending on how the ductwork is configured. – Jassem Abdal Jan 28 '19 at 17:00
  • Are you tapping into a 6' line and trying to add another register? – Ed Beal Jan 28 '19 at 19:39
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A 6" duct should feed a 4x10 or 3x10 standard adjustable floor register. The round duct has a cross section area of about 30 sq. in. In a well designed duct layout there would not be excessive pressure at any register, so closing the adjustment vanes any amount should not be a problem.

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