I am in the middle of building a rack :crazy02: , and I have not yet decided on how many strips of heat tape to use. I plan on using the 4 inch heat tap, unless otherwise advised, on the back of the rack. The rack is 36 inches wide and 42 inches high. It will have two 28 quart tubs on each shelf and 6 shelves high. I am leaning towards three strips, but wonder if I should use four. Does any one have a similar setup? Thanks for the imput.