WAC 296-806-42514. Safeguard proof boxes

(1) You must make sure all door locks can be operated from both inside and outside the proof box. (2) You must provide guide rails to center the racks as they enter, pass through, and leave the proof box if pans, boards, or trays may be easily dislodged. Note: Guide rails are not required in proof boxes unless there are two doors with a pass through or pull through design.