When building in a Sharp countertop microwave oven be sure to use the proper Sharp built-in kit. All Sharp kits are UL approved and provide duct work to assure proper air circulation around the product. The Sharp RK-94S27 27-inch 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.