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Thread: Add return duct to existing central return?

  1. #1
    Join Date
    Jul 2020
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    Add return duct to existing central return?

    I have 1986 home that's 1700sqft with a new 3 ton single stage system installed. I have a central return in the hall way with transfer grilles in the bedrooms. My return duct is undersized at 16" so I was looking to add more. The current plenums are not wide enough to accept a 18" or 20" duct so I was wondering if I can just add a 12" duct alongside the current 16" to get more flow?

  2. #2
    Join Date
    Jul 2013
    Richmond, VA
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    If you mean add a 12" duct to the return plenum, then yes. If you mean add a 12" duct to the 16" duct, then no.
    Everything Im going to say today are my conclusions and my opinions, my opinions are based on my education, my training, my experience. Different people have different experiences, so they have different opinions and I make no claim that my opinion has its origin in the mind greatness. - Paul Harrell

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