THE SYSTEM IS OPERATING THE WAY IT IS DESIGNED. AIR FLOW, PRESSURES AND DRAINS ARE GOOD. THE ONLY PROBLEM I SEE IS THE OPERATING ROOM HAS THE THERMOSTAT MOUNTED IN IT AND IT ALSO HAS TWO MAIN SUPPLIES AND ONE RETURN AND IS DIRECTLY BELOW THE REAR UNIT. THE FIX WOULD BE TO INSTALL TWO 2X2X6 DIFFUSSERS WITH A BUTTERFLY BAFFLE IN THEM TO SHUT DOWN 30-40% OF THE AIR GOING TO THAT ROOM. SENT OVER ESTIMATE FOR DIFFUSSERS.