Features Durable construction. 2-steps in operation:-Retard Proof Available with single door or double door, four door. Digital control panel, can be customized. Working fast and efficiently, yielding even proofing with full loads or partial loads. Built with durable components, reliable easy-to-use controls, and built refrigeration systems. Retarder proofer makes the process of proofing easy and consistent, keeping uniform temperatures throughout the racks and even constant airﬂowwhile adding the versatility of retarding in the same space.