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Title: Narrower than advertised
Review: The internal width of the cover is 5 and 3/8 inches. This is about an inch narrower than most modern thermostats. At the same time, the depth is 2 and 3/4 inch. This is probably an inch deeper than required or desired. The internal height is a little more than 4 and 1/2 inches. It does have ventilation slots all the way around, so it should work well for those thermostats it fits.
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