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How to Choose a Built in Microwave For Wall Unit A built-in microwave that is designed for wall units offers a sleek appearance in your kitchen, and frees space on the counter. They can also be set at a suitable height or next to other cooking appliances, like an oven that is wall mounted. You can install them in a cabinet or appliance garage to block them from view, and they come with trim kits for an individual look. They can be fitted with child safety locks to protect against accidenta