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Originally Posted by RubHer Yellow Ducky
The metal shelving will heat faster, maintain the heat and radiate it back into the room more then the wood shelves will. Metal itself in not an insulater whereas wood is...
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hmmmmmmmmmm,
here is what I got on another forum, from an engineer.....
burn-in is a process with electronics where you set the unit up as it will be used and let it run for a while to test for failures before you put it into production. It helps to catch infant mortality (most electronic parts will either die in their first few hours of use or last for years, barring abuse).
To answer the question, no, assuming a closed system the material the shelves are made of won't affect the overall temp. The metal shelves will act as a better heat-sink and help prevent hot-spots in the room by transmitting heat more readily, but otherwise no difference.
-E