BACK TO PREVIOUS PAGE Rack Proofer Rack Proofer. An automatic final proofer (q.v.) in which the panned dough (q.v.) is conveyed through the proofing chamber on stabilized racks (q.v.) consisting of six to ten grid-type shelves. The racks form an integral part of the proofer and travel through one vertical loop for the required period of time, with automatic loading and unloading.