HVAC - How to Make a Return Air Grille "Shut Up"

HVAC - How to Make a Return Air Grille "Shut Up"
  PutSome5tankOnIt
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We've all heard noisy returns. How do you quiet them down? Make the return air duct  ...  length slows air velocity.  ...  increase plenum volume. It works wonders when you allow a return air duct to draw air from a plenum, instead of drawing ai

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