A:Answer Hi MaryAnne - All 30" over-the-range microwaves are approximately the same width, and are designed to fit into a 30" wide cabinet opening. Each microwave comes with the mounting hardware (mounting bracket, screws, exhaust adapter), top and rear templates, and installation instructions needed to make installation a simple process. If installed in a 15"-16" deep cabinet, we offer optional 15" Cabinet OTR Bump Out Kit JX15BUMPWW (sold separately). See Quick Specs at the following link: https://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=340168_jvm3160df_c3.pdf - Thanks for choosing GE! Sue