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1224.4.9.2 Operation and Sills
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Patient room windows shall have sills not more than 36 inches (914 mm) above the floor. If operable windows are provided that require the use of tools or keys for operation, the tools or keys shall be located at the nurses' station.
Exception: Window sills in intensive-care units may be 60 inches (1524 mm) above the floor.
If operable windows are provided in airborne infection isolation or protective environment rooms, they shall only be operable by the use of tools or keys which shall be located at the nurses' station.