https://opensourcebridge.scien....ce/wiki/Why_Black_Bu
Built in Oven and Microwave Combination Contrary to counter-top models, these appliances are installed in cabinets for a streamlined look. They are a good choice if you are on a budget, but you want a central cooking system. When selecting a built-in oven and microwave combination, take into consideration power levels, size capacity, racks/turntables as well as cooking control options. Look for models with child safety locks that can stop children from using the appliance. Space-saving If you're