What is the room temp? Racks are very efficient space wise but very in efficient heat wise and basically must be in a room that is at least 80º to hold 80/90 temps. The second thing I am not completely sure about but I believe that the max temp of flexwatt heat tape is recommended to be no hotter than 100ºF I could be wrong I don't recall where I read that but I think it was with the small book that came when I ordered my flexwatt.
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