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Old 04-30-2023, 09:13 AM   #8
twindman
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Join Date: Apr 2006
Location: Mesa az
Posts: 2,953
M.O.C. #5651
Does your vent have a protective flap over the opening - when microwave is blowing out it opens and drops shut when not. Mine has a little clip that rotates and locks it closed which I leave shut all the time as we don't use the exhaust much. Maybe during a hard rain the wind blows the flap up and lets water in?????
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