This kit allows microwaves to be built into a wall or cabinet. Place a microwave inside this kit to provide stability and ventilation for your unit. The cabinet or wall opening must be within the following dimensions: 15-11/16 to 16 High 22-1/6 to 22-3/8 Wide and a minimum depth of 20-3/8 . Trim kit dimensions: Cutout Height: 15 11/16 - 16 Cutout Width: 22 1/16 - 22 3/8 Cutout Depth: minimum 20 3/8