Not sure if there is a general "rule of thumb" .....
but my racks all use 4inch heat tape. Until you get to the 41 qt size. Here's a picture! I even use 4 inch in my incubator..lol.
I guess it mainly depends on what you set your thermostat to. Smaller tape means it will stay on more, and larger tape means it will not be on as long. I place my temp probe mid way down the rack and set the temp per rack...None of my 3 are actually set at the same temp
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