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I can answer that question as I asked it at the service center long ago.It was a vent to nowhere.. The explanation I got was that it was a heat release vent for the converter. Meanwhile said I hot air rises and that hole is lower than the converter.... We installed a 4 inch muffin fan in the hole sucking the hot air from the W/D into the ceiling and out the roof vents . It gets very hot in that closet when the Dryer is running.
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