Can I replace a 1.3 cu ft otr microwave with a 1.5
Brackets can remain the same throughout a particular brand for several years but will also change every year at times. Same year and same brand, I would say yes. Different year of manufacture or different brand name I would say, no it will not fit the existing brackets. If you have a particular brand in mind and have the model number of the existing OTR, it is usually possible to search out installation instructions for both at the manufacturer's website. You could then compare to see if they will match up. The two screws through the upper cabinet floor into thr top of the OTR can vary, within a particular brand even in the same year of manufacturer.
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