Proofer Accessory Shelf with Folding Legs Black Widow Scarlett Johansson Natasha Romanoff by Puschl1 on DeviantArt. Accessory Shelf with Folding Legs for the Folding Proofer Dimensions: 12. 5" x 15" x 4" (Opened). Creates a second level in the Proofer 4 inches higher. Ideal for proofing two sheet pans or four loaf pans. Rack has fold out legs for easy storage. Legs are held in open position by clips that keep them from damaging loaves on lower shelf when placing in or removing from proofer.