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I have an 900 watt emerson microwave that looks similar to this one: emerson microwave

It weighs about 30 pounds and the outside dimensions are about 19" (W) x 16" (D) x 12" (H).

We normally have it sitting on the kitchen counter space but my significant other would like it put in a more discrete location and suggested moving it to a semi-permanent location in the cupboard shelf.

I'm reasonably certain that it'll fit in the shelf and am confident that the shelf could hold the weight (and any heavy items we cook) but I'm concerned about ventilation. The manual says:

Ventilation: Do not block air vents. If they are blocked during operation, the oven may overheat and eventually cause oven failure. For proper ventilation, keep three inches of space between the oven’s top, sides, rear and the area where the unit is to be installed.

The shelf would have that 3" breather room but not much more. Does that sound OK? Am I worrying over nothing? Is there anything else I need to be conscious of here?

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2 Answers 2

up vote 3 down vote accepted

Microwave ovens do not generate heat themselves, but cause the food itself to heat up. As such there is not a lot of heat output from the unit, but there is expanding air as the food warms the air in the chamber.

Reputable manufacturers are fairly conservative about their venting requirements. If you meet those requirements, you should be OK.

Another consideration is clearance for the door swing and for moving dishes in and out of the unit. Make sure that its positioning does not cause you to be handling a hot dish at an awkward angle. Also high shelves are a bit risky since you would be handling hot food at head and face level. A singed hand pulled back could lead to a bad scalding.

Finally, you need to be sure that there is an outlet nearby of the proper amperage. A 900 watt microwave draws about 8 amps. A line with a number of other heavy duty appliances on it may pop circuit breakers.

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The electrical code of some (many? most? all?) areas require all appliances, including microwaves, to be on a separate circuits. This isn't an issue when it's just sitting on a counter-top but a dedicated enclosure changes things. If you ever plan to sell the house, it would be best to try to meet your local code. –  Brian White Oct 9 '12 at 0:40
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It doesn't sound like he's constructing a new enclosure. Just placing the microwave on an existing shelf. And plugging in a portable microwave doesn't activate new code requirements, though installing a built-in one might. Still, it's a good idea to use a dedicated circuit for the reasons bib outlined. –  Shimon Rura Oct 9 '12 at 3:16
    
Right - no new enclosure. Just putting it in a cupboard shelf that already exists. Good points though. Thanks! –  Mike B Oct 9 '12 at 16:06

As long as you meet the minimum clearance requirements your microwave will be fine. The shelf above may have some issues with the steam and moist air that will be released from the heated food. Watch for damage if it unprotected wood or a laminate.

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+1. My main concern would be the moisture. –  Henry Jackson Oct 8 '12 at 23:54

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