January 23, 2015
Hello - this is Nancy at GE and I am happy to help you. If you had the JE1640 microwave built into a cabinet, it should have used the approved trim kit with the following cabinet cutout dimensions: 17-9/16" H x 24-1/8" W. Since we do not have a direct replacement, two microwaves that you could use to replace your current unit would be the PEB7226SFSS which uses a trim kit that requires a cabinet cutout of 16-3/4" H x 25-1/2" W. Otherwise, you could go with the PEM31SFSS whose trim kit requires a cabinet cutout of 15" H x 24-7/8" W. You may also want to look at a built-in Advantium 120, Model #PSB9120SFSS, which is a microwave with oven capability and requires a cabinet cutout of 17-1/2" H x 25-1/8" W. I hope this helps! Thanks for checking with us!
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