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grille return size

  1. HVAC
    The opening for my cold air return is an odd size, 11 5/8 by 19 1/4. The height I can change because it is drywall, but the width is fixed between 2 studs. What would be the correct size return grill for this opening? 12x20 seems too wide and 10x20, or even 11x20, seems too narrow. TIA
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