Door Must Be Kept Closed Sign

Door Must Be Kept Closed Sign – MS0046

The Door Must Be Kept Closed Sign marks a door that forms a fire, smoke, or watertight boundary and must remain closed at all times, not only during heavy weather at sea but as a matter of continuous shipboard discipline. This mandatory sign instructs crew and passengers not to prop, wedge, or otherwise leave the door open, preserving the integrity of the compartment or fire zone it protects.

Manufactured from durable photoluminescent material, MS0046 continues to glow after the ship’s main lighting fails, keeping the instruction legible during a blackout, dense smoke, or a night-time transit through the space. Its blue circular mandatory-action field with bold white text is designed for instant recognition on doors throughout accommodation, machinery, and service spaces, supporting the IMO’s emphasis on clear, standardised shipboard signage.

Why the Door Must Be Kept Closed Instruction Matters

A door left open for convenience during routine work defeats the purpose of the boundary it forms, whether that boundary is intended to contain fire and smoke or preserve watertight subdivision. A clear, standardised keep-closed instruction reinforces correct practice for every crew member and passenger, reducing the chance that the door is left open and creating a hidden risk that may only become apparent during an actual emergency.

Compliance and Certification

MS0046 is produced to support compliance with the vessel’s Safety Management System under the ISM Code, and door-closing discipline for fire and watertight boundaries is addressed within SOLAS Chapter II-1 and Chapter II-2 structural fire protection and subdivision provisions. For the full regulatory text, see the IMO’s SOLAS convention overview. Maintaining clear, legible signage on every such door supports a positive outcome at Port State Control and flag-state inspections.

Installation Recommendations

Install MS0046 directly on or immediately adjacent to the door at eye level, positioned so anyone passing through sees it clearly both approaching and after crossing the threshold. Mount on a flat, stable surface using marine-grade adhesive or corrosion-resistant fasteners suited to the surrounding finish. Reinforce the instruction through crew training and routine fire and watertight door rounds.

• Photoluminescent pictogram charges under ambient light and glows during power loss
• Bold mandatory-action blue circle format for instant multilingual recognition
• Rigid, UV-stable substrate engineered for continuous marine and interior exposure
• Compact format suited to accommodation, machinery, and service-space doors
• Supports ISM Code safety-management and SOLAS boundary-integrity documentation

Equip every door aboard your vessel that must stay closed with the MS0046 Door Must Be Kept Closed Sign, and keep fire and watertight boundaries compliant and reliable when it matters most.

Complete your vessel’s safety signage programme by pairing this sign with our Hazard Signs and Fire Fighting Signs ranges, ensuring full coverage across every shipboard risk area.