When building in a Sharp countertop microwave oven, be sure to use the proper Sharp trim kit. All Sharp kits are UL approved and provide duct work to assure proper air circulation around the product. The Sharp RK-94S30F 30-inch flush mount built-in trim kit is compatible with the Sharp SMC1585BS microwave oven. It will provide ventilation as required and delivers a clean look that integrates the microwave into the wall or cabinet.