“What size vent, 4 inch or 6 inch?”

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• Hi, Lynn! For satisfactory air movement, the total duct length of 3-1⁄4” x 10” (8.2 x 25.4 cm) rectangular or 5" or 6" diameter round duct should not exceed 120 equivalent feet (36.5 m). ~ Brandi

  Answered by FrigidaireSupport 6 years ago

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