Many racks use 4 inch. Mine does, it works fine because the tape has some separation from it to the tub allowing the heat area to spread. It spreads quickly exactly like light does. Racks also rely on ambient temps to help out. They simply do not perform correctly um modified below 68 degrees. They really do best at or near 80. This helps control the cool side temps. Flexwatt being radiant heat does not efficiently heat air so typically it can only add a few degrees.
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