Machinery Closing Device Sign

Machinery Closing Device Sign – FS0098

This machinery closing device sign shows the standard IMO fire control symbol for a closing device, a hinged flap shown swinging closed over an opening with a directional arrow, marked with the letter “M” to identify a closing device serving machinery spaces. It follows the standard IMO fire control symbol convention used on fire control plans and at the equipment itself, so the symbol is recognisable to crew regardless of language.

Where this machinery closing device sign is used

A closing device seals an opening in a bulkhead, deck, or duct run, such as a fan intake, extraction outlet, or skylight, closing automatically or via manual or remote operation to stop fire, smoke, and fresh air feeding a fire from passing through the opening. This sign marks a closing device serving machinery spaces specifically, as opposed to the lettered versions used where multiple closing devices at one location each serve a different area, such as the accommodation closing device sign or a cargo space closing device.

This machinery closing device sign is fixed directly at or beside the closing device itself, typically near a ventilation opening on an engine room casing, on a fire control plan, or at another position that lets crew and surveyors quickly confirm which closing device serves which space. Machinery spaces carry a high fire risk from fuel, lubricants, and hot surfaces, so confirming the closing device protecting the machinery space boundary is intact and correctly identified is a priority during any inspection.

Closing an opening during a fire cuts off one of the main paths smoke and flame can travel through a vessel, and starves a fire of the fresh air it needs to spread. Closing devices work alongside fire doors and dampers as part of a coordinated shutdown of the affected fire zone, so an opening left uncovered at an unmarked or misidentified closing device can undermine the entire zone’s fire rating, particularly around a machinery space where a fire can escalate quickly.

This sign is checked during SOLAS fire safety surveys, where the surveyor confirms that closing devices are clearly marked, correctly labelled for the space they serve, and remain accessible and unobstructed. Correct labelling of closing devices is a standard item reviewed during these inspections, since a mislabelled or missing sign can slow down both routine testing and an actual emergency response.

New crew should be shown the location and correct manual operation of every closing device on board during safety familiarisation and fire drills, since hesitating to find or identify the right closing device can allow smoke to spread further before the opening is finally sealed. Clear, consistent labelling like this machinery closing device sign removes that hesitation.

Consistent signage also matters during a routine walk-through inspection, since a closing device without a clear label can slow down an auditor trying to confirm the vessel’s fire control plan matches what is actually fitted on board. Fitting this machinery closing device sign at every relevant closing device keeps the fire control plan easy to verify against the equipment in place.

Closing devices should be tested regularly as part of the vessel’s routine fire safety equipment checks, since a device that fails to close during an actual emergency defeats its purpose. Marking each closing device clearly with this machinery closing device sign also makes it easier for the crew member responsible for testing to locate every closing device on board without needing to consult a separate equipment list.

Technical specifications:
SKU: FS0098
IMPA: 33.6788
ISSA: 47.567.88
Compliant: IMO Resolution A.1116(30)

• Fire-retardant marine-grade material
• Available in non-glow vinyl, general purpose glow, or DNV Wheelmark certified Class C / Class D photoluminescent film
• Waterproof and saltwater resistant
• Glossy wipe-clean finish
• Peel-and-stick installation, no tools or drilling

Supplied ready to apply directly at the closing device. Available in the standard size shown above.

This sign is produced to IMO fire control symbol specifications for consistent recognition across international fleets. Need a different size or a custom layout? Contact us for a quote.