Are you talking about the metal wire shelves? If so, those are great with Flexwatt. The metal helps spread the heat and helps "smooth out" the temperature under the box without sucking away too much of the heat energy. If the ambient air temp is cool, likely no dimming is necessary in that scenario. However, always have a controller wired into the setup.

Better to use the bare metal wire shelves as opposed to that plastic coated stuff, but either works. You do not need a conventional rack system. Wire shelves are awesome for plastic boxes as described.
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Mark

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