Lang Manufacturing Full Size View Front Proofer. Approximate estimated capacity: 528 sq.ft. Unit has 24 supports for trays of dimensions 11 in. L x 24 in. W. easily viewable through three glass front doors. Both temperature and humidity are dial controlled and a water warning lamp glows when the water reservoir is out of water. Electrical requirements: 120V, 16.7 amps, 2000 watts. The model PF-F-3 proofer provides one of the most important and delicate stages in the baking process by accelerating the fermentation of yeast in a warm, moist environment causing the dough to rise. Approximately 50% of product volume is created in this process. Overall dimensions: 2 ft. 2 in. L x 2 ft. 9-1/2 in. W x 5 ft. 11-1/2 in. H.(H17)(ACN14).