A hatch is provided in each Operation theatre to remove waste materials from the operation theatre to dirty linen area just adjacent to Operation Theatre. Each hatch is equipped with two doors and the doors is electronically interlocked i.e. the hatch is designed in such a way that only one door is opened at one time. The UV light is installed that it is kept on while both the doors are closed. This UV light has to be automatically turned off in case of opening of either of the doors. There shall be indicators on both sides of the OT so that the door open / close status can be monitored from both ends.