Using the Bradley 9813-00 Specimen Pass-Thru Cabinet is easy. First, make sure the rough wall opening matches the required dimensions of 11 5/8 inches wide and 10 7/8 inches high and that the wall thickness is between 3 and 5 1/2 inches. Remove one flange, slip the unit into the wall, replace the flange, and secure it to the cabinet with the included concealed mounting screws. Tighten the screws on the opposite flange. When using, keep in mind that the interlock mechanism allows only one door to open at a time, so don't try to force both doors open. To clean, simply remove the spill tray. Regularly check the hinges and pull knobs for any signs of wear and tear. If you notice any issues, contact the manufacturer for assistance.