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Hey there, great question! This trim kit's interior dimensions of frame opening are approximately 22.8" W x 12.3" H. The depth (thickness) of the trim kit is about 1.2". A built-in capable countertop microwave will list the 27" and 30" trim kit for that model in the product specifications. The only difference between the 27" and 30" trim kit is the trim frame. If the microwave is installed over a 27" or 30" wall oven, be sure to match the trim kit width to the wall oven. Thanks for checking. Let us know if any other questions come up. -Mikayla@GEA
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