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This Door Must be Kept Closed

A "This Door Must Be Kept Closed" sign is important because it serves as a clear reminder to keep specific doors shut for safety and compliance reasons, particularly in fire safety and building security. In many cases, these doors are fire doors, designed to slow the spread of fire and smoke, protecting escape routes and giving occupants more time to evacuate safely. Keeping these doors closed is critical to their function. An open fire door can ..