Hi Theresa, here are a few details on the proofing box that may be helpful:

• Capacity to hold the following: three 8½" x 4½" loaf pans OR two 9" x 5" loaf pans OR one 8" round or square pan OR one 9" round or square pan OR one 9" x 13" and one quarter sheet pan
• Inside box (open): 12½" x 15" x 8½" high
• Outside body (open): 18" x 14½" x 10½" high
• Outside body (closed): 18" x 14½" x 2½" high

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