The microwave “cut-out height” is a specific measurement required when installing an appliance into a fixed space, such as a cabinet or above a range. This dimension defines the required vertical space within the surrounding structure, not the height of the microwave itself. Understanding this measurement is crucial for ensuring a successful and professional-looking installation.
What the Cut-Out Height Represents
The cut-out height defines the required vertical dimension of the cabinet opening or wall space where the microwave will be housed. This measurement is primarily a concern for built-in and over-the-range (OTR) microwaves, which are designed to be permanently mounted and fit flush with the surrounding cabinetry. Manufacturers specify this height to ensure proper clearance for the appliance, including necessary ventilation space.
For built-in models, the cut-out height is often dictated by the dimensions of the accompanying trim kit. This trim kit is a decorative frame that surrounds the microwave, giving it a seamless, integrated appearance. The trim kit’s installation instructions will provide a precise range for the cabinet opening’s height and width, which must be followed exactly for the frame to sit flush and cover the necessary gaps.
The actual height of the microwave appliance is typically slightly less than the required cut-out height. This small difference allows for the necessary mounting hardware, brackets, and a small amount of tolerance for installation.
Measuring Your Space and Matching the Microwave
Accurately measuring the existing space is the first step in matching a new microwave to your kitchen. The cut-out height is measured from the top surface of the cabinet opening to the bottom surface of the opening. It is important to measure this distance in multiple spots—on the left, center, and right sides—because cabinet construction can sometimes be slightly uneven.
When multiple measurements are taken, the smallest recorded height should be used as the controlling dimension for the space. This ensures that the new appliance will not be too tall to fit into the tightest point of the opening. Once the space is measured, you must consult the manufacturer’s cut-out specifications, which are usually found in the appliance manual or on the product’s technical sheet.
The goal is to find a microwave whose required cut-out height falls within the range of your measured space. For example, a manufacturer might specify a required cut-out height of 16.75 inches to 17 inches. If your measured space is 16.8 inches, the microwave is a suitable match.
Why the Right Height is Critical
An incorrect cut-out height can lead to installation failure or safety hazards. If the cabinet opening is too short, the microwave simply will not slide into the space, preventing the installation entirely. This often requires costly modifications to the existing cabinetry to increase the vertical dimension.
If the cut-out height is too tall, the microwave will have unsightly gaps above or below the unit, or the trim kit will not sit flush against the cabinet face. This compromises the clean, built-in aesthetic. Furthermore, a loose fit can affect the stability of the appliance when opening and closing the door.
For over-the-range models, an incorrect height directly impacts safety and building code compliance. OTR microwaves must maintain a minimum clearance, typically 30 inches, between the bottom of the cabinet above and the cooking surface below. If the new microwave is too tall for the space, it can reduce the required clearance above the range, which is a fire safety concern.