A failsafe is a great plan, especially with a rack. There are more than one post here about a pulled off probe that went unnoticed the results are catastrophic. A fail safe prevents all of this type of calamity.
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Racks need warm rooms to work well. When a rack is in a cool space the typical methods fly out the window. My rack is in a cool space and I need hot side and cool side heaters but more than that upper and lower sets too as the top is very different than the bottom. I have a four probe rack but in the case of a prewired rack and that situation the heating would have to be completely re-done for a set up like mine.
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