Can You Mount a Microwave Under Metal Cabinets?

Installing a microwave under metal kitchen cabinets requires careful consideration. Metal can interfere with microwave signals, so special precautions must be taken. Here is a detailed guide on whether and how to mount a microwave under metal cabinets safely.

Overview

Microwaves work by emitting electromagnetic waves that cause water molecules in food to vibrate and generate heat. This allows food to cook quickly.

Metal reflects electromagnetic waves instead of absorbing them. So mounting a microwave directly under metal cabinets can lead to problems:

• The metal can block microwave signals, preventing food from cooking evenly.
• Metal too close to the microwave can cause arcing, leading to damage.
• The metal may overheat from exposure to the microwaves.

However, with proper precautions, it is possible to install a microwave under metal cabinets safely. The key factors are:

Distance Between Microwave and Metal

The microwave must be far enough under the metal so signals can pass over the cabinet and reach food. The absolute minimum distance is 3 inches. But allow even more space if possible – up to 12 inches is ideal.

This prevents microwave signals from bouncing off the metal and creating uneven cooking. It also reduces the chances of overheating the cabinets.

Ventilation

Sufficient airflow must be allowed so the microwave does not overheat. There should be open space behind and beside the microwave.

If the cabinets have a solid back, cut openings to allow ventilation. Adding a ventilation fan helps too. Proper airflow prevents damage to both the microwave and cabinets.

Microwave Design

Choose a microwave designed to operate safely near metal. Look for models advertised as “metal cabinet safe.”

These microwaves have special shields and internal designs to prevent interference. The door seal and latch also minimize signal leakage.

Using a microwave not rated for metal cabinet use is risky and can result in arcing or uneven cooking.

Microwave Output Power

Higher microwave wattage increases risks near metal. Opt for lower-wattage models (900W or less). This gives more margin of safety.

Combination microwave-convection ovens are ideal. They use lower microwave power alongside convection heating for better cooking with less metal interference.

Cabinet and Wall Materials

Use microwave-safe materials behind and around the installation area:

• Metal mesh or foil panels can block signals. Remove any in the vicinity.
• Moisture in wood or drywall can cause arcing. Use fire-resistant and moisture-sealed materials.
• Choose paints designed for high-heat areas around ovens and stoves. Avoid metallic paints.

Electrical Connection

Plug the microwave directly into a properly grounded outlet. Do not use an extension cord, as it can overheat.

Ensure the outlet is far enough away and not directly behind the microwave. Position the power cord carefully to minimize exposure to microwaves.

Avoid any loose wire connections or damaged supply wiring, which increase arcing risk.

Testing and Monitoring

After installing, test the microwave with a cup of water. Look for hotspots or uneven cooking, which indicate problems.

Periodically inspect for signs of overheating on cabinets and walls around the microwave. Stop using the microwave if any issues are found.

Microwave Installation Steps Under Metal Cabinets

When preparing to install a microwave under metal cabinets:

1. Select a microwave rated as metal-cabinet safe, with sufficient clearance.
2. Remove any metal mesh, foil, or metallic items from the installation area.
3. Seal the cabinets and walls with moisture-resistant and fire-retardant materials.
4. Allow proper ventilation space above and around the microwave.
5. Use rated outlet and safe power cord routing away from the microwave.
6. Mount the microwave using an overhead cabinet installation kit.
7. Test microwave performance with a cup of water on high power.
8. Do periodic safety checks to ensure no overheating.

With proper selection and installation, it is possible for a microwave to function effectively and safely under metal cabinets. Pay close attention to clearance, ventilation, microwave rating, materials, electrical considerations, and ongoing monitoring. Taking these precautions allows enjoying the convenience of an under-cabinet microwave installation even with metal cabinets.

Frequently Asked Questions

Can you put a microwave under cabinets?

Yes, microwaves can be installed under cabinets as a space-saving option. The key considerations are having enough overhead clearance and adequate ventilation. Non-metal cabinets are safest, but metal cabinet installation is possible with proper precautions.

What is the minimum height above a microwave?

The absolute minimum overhead clearance for a microwave is 3 inches. But allowance of much more space is recommended – ideally 12 to 20 inches above the microwave.

How far should a microwave be from cabinets?

The microwave should have open space behind and on the sides for airflow. A minimum of 3 inches is needed but more is better. For metal cabinets, 12 inches or more above is ideal.

Do you have to vent a microwave under a cabinet?

Yes, a microwave installed under a cabinet needs proper ventilation. Allow open space around the unit and cut ventilation holes if the cabinet back is solid. Adding a vent fan helps exhaust heat and moisture.

Can you put a metal shelf above a microwave?

No, do not place metal shelving directly above a microwave oven. The metal can interfere with microwave signals and cause arcing. Allow adequate open space above, with non-metallic materials only.

What happens if a microwave is too close to metal?

Putting metal too close to a microwave can block signals, cause arcing between the metal and microwave, or make the metal overheat. This can lead to uneven cooking, sparks, and potential damage. Minimum clearance is key.

Can you put tin foil in a microwave?

No, never put tin foil or any metal into a microwave. Microwaves cannot penetrate metal, so arcing and dangerous sparks can occur. Food should not be cooked in foil containers either.

Conclusion

Mounting a microwave oven under existing metal kitchen cabinets is possible, but proper precautions must be taken. Sufficient overhead clearance is essential, along with good ventilation and using a microwave rated as metal-cabinet safe. With minimum 3-inch clearance, lower wattage, and microwave-safe materials, operation can be safe. Carefully installing the microwave using best practices allows enjoying the convenience of this under-cabinet installation, even with metal cabinets present. Just be sure to do testing and ongoing monitoring to catch any potential issues before they become problematic.