‘B’ Self-Closing Watertight Fire Door

IMO ‘B’ Self-Closing Watertight Fire Door Sign – FS0231

This ‘B’ self-closing watertight fire door sign, marked “WT” with a downward self-closing swing arrow, identifies a hinged fire door within a ‘B’ class fire division that closes automatically and carries a full watertight rating. The self-closing mechanism drives the door shut after use, restoring both the fire division and the watertight boundary without relying on crew action.

A self-closing watertight fire door that is wedged or tied open loses its protective value at once – both fire integrity and the watertight seal are defeated the moment the door is held open. This sign reminds crew and passengers to let the door close fully and never obstruct its swing.

Where this self-closing watertight fire door sign is used

Self-closing watertight fire doors of this type are commonly fitted at internal ‘B’ class partitions where a watertight seal is also required, including boundaries near galleys, laundries, or other service spaces that sit within accommodation blocks. This self-closing watertight fire door sign is mounted directly on or beside the door leaf so it is seen every time the door is passed through.

Installing this self-closing watertight fire door sign is straightforward: the peel-and-stick backing adheres directly to the door leaf or adjacent bulkhead, and the photoluminescent film charges under normal lighting so the pictogram remains visible if power and lighting are lost. Crew training and drills should always cover the correct operation of every self-closing watertight fire door on board, since a door that fails to latch fully can compromise both fire and watertight integrity at once.

Regulatory context

Fire and watertight door classifications follow SOLAS Chapter II-2 and the SOLAS watertight subdivision requirements, which set the fire-resistance rating, self-closing requirement, and watertight standard for doors of this type. Surveyors checking every self-closing watertight fire door and its signage during inspections expect clear, photoluminescent identification at each opening, and will typically test the door’s self-closing action as part of a routine fire safety survey.

‘B’ class divisions carry a lower fire-resistance rating than ‘A’ class divisions under SOLAS Chapter II-2, and are typically used for internal partitions rather than main structural fire boundaries, though the self-closing and watertight requirements for a self-closing watertight fire door remain equally important regardless of the division class.

Technical specifications:
IMPA: 33.6764
ISSA: 47.567.64
SKU: FS0231
Compliant: IMO Resolution A.1116(30)

• Fire-retardant photoluminescent 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

Manufactured to IMO photoluminescent standards, this sign is part of our full range of Fire Fighting Signs.

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