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Several years ago my microwave oven stopped working. I had noticed it was always cold near it in the winter, warm in the summer and I could hear the neighbor's dog barking real well all year long. Also significant dust in the area. When the externally vented microwave oven was removed from the wall, I discovered the vent baffle door was bent during installation and was always at least 50% open. I could not believe the shoddy construction but there it was in front of me. I blocked off the vent and purchased an internal vent microwave. The dust problem is gone, the heat and cold issues are no more and the dog still barks but I do not hear him as well. Energy bills have went down but with all of the other modifications to dual pane windows, sun screens and weatherstripping, it is impossible to quantify the savings of the internal vented microwave oven.
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