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I believe these microwaves are designed for household and RV use. Households don't have an exhaust port to the outside. The microwave come with a panel covering the RV exhaust port and it is not uncommon (like Frank's unit) to find they old world's craftsman at Montana forget to remove it.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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