A:Answer Hi Skye- 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). When replacing an over-the-range microwave, the mounting bracket included with the new microwave should be used since the mounting bracket is specific to each model. The new screws, bolts, and exhaust adapter should also be used. Also, the microwave ovens are designed for adaptation for the following three types of ventilation: Outside Exhaust (Vertical – Delivered from factory in vertical position). Outside Exhaust (Horizontal). Recirculating (Non-vented ductless). Check out our GE® 1.9 Cu. Ft. Over-the-Range Sensor Microwave Oven JVM7195SKSS with sensor cooking controls and our new dark gray, easy -clean enamel interior with Steam Clean option. Play Video: https://youtu.be/wSIh-YJSlt0?list=PLX8_V2wHGuhntzHGB3F5dEMg4YMkWMcxt - Keep in touch! SUE@GEA