‘B’ Self-Closing Sliding Watertight Fire Door Sign

‘B’ Self-Closing Sliding Watertight Fire Door Sign – IMO A.654(16) Fire Control Symbol FS0239

This ‘B’ Self-Closing Sliding Watertight Fire Door sign identifies a sliding door built to B-class fire integrity with full watertight closure, fitted with an automatic closing mechanism that operates along the door’s track. The pictogram shows the “WT” designator in yellow with a directional arrow above the offset bar and dashed track symbol, distinguishing it from the red A-class version and matching exactly what appears on the vessel’s fire control plan for this opening. As SKU FS0239 in the Fire Fighting Signs range, it is designed for permanent fixing on or beside self-closing sliding watertight fire doors within accommodation and lower fire-rated structural areas that still require full watertight closure.

Combining a B-class fire rating with full watertight closure is less common than the A-class equivalent, and this door type is typically found in specific accommodation or internal locations where space constraints favour a sliding mechanism but the compartment still requires watertight subdivision. Because the door self-closes automatically along its track, it maintains both functions every time it is used without depending on crew to shut it manually, which is valuable in areas with frequent foot traffic. The photoluminescent background of this sign keeps the door’s function identifiable during a blackout, when confirming closure of a sliding mechanism is visually more difficult than with a hinged door.

Why B-Class Sliding Watertight Fire Door Identification Matters

Correct identification prevents crew from confusing this door with the more common A-class sliding watertight door or with standard B-class hinged fire doors elsewhere in accommodation spaces, each of which carries different fire integrity and closing characteristics. Clear signage also reminds crew never to obstruct the sliding track, since a jammed mechanism compromises both the fire rating and watertight closure simultaneously. This distinction matters during fire drills and watertight door testing rounds, where B-class and A-class doors must be logged and tested according to their correct rating.

Compliance and Certification

This sign reproduces the fire control symbol set derived from IMO Resolution A.654(16) and continued under the current ISO 17631 standard for fire control plan graphics, matching what flag-state surveyors and classification societies expect to see identifying B-class self-closing sliding watertight fire door function. SOLAS Chapter II-2 and Chapter II-1 set the fire integrity and watertight standards this door must meet, and correctly labelled sliding door arrangements are checked during Port State Control inspections and class surveys. Fitting SKU FS0239 keeps your sliding door signage matched to the fire control plan surveyors will review.

Installation Recommendations

Fix this sign directly on or beside the sliding door frame or track housing at eye level, using the pre-drilled fixing holes for a permanent mechanical fixing, or the self-adhesive backing on painted surfaces where a mechanical fixing is impractical. Keep the sign clear of the door’s sliding path and any local control stations, and in accommodation alleyways position it where it remains fully visible despite frequent cleaning and passing traffic. Check the sign periodically alongside the self-closing mechanism during routine fire and watertight door testing rounds.

• Standard IMO/ISO 17631 fire control symbol – yellow “WT” designator with self-closing sliding track symbol
• Photoluminescent base for visibility during blackout or power failure
• 150x150mm rigid or self-adhesive format to suit steel door and frame surfaces
• Durable finish suited to accommodation and internal structural environments
• Matches fire control plan symbols exactly for fast, confident door mechanism identification

Order the FS0239 ‘B’ Self-Closing Sliding Watertight Fire Door sign to keep every self-closing sliding boundary on your vessel correctly identified before your next drill or survey. Safety Sign Hub stocks the complete IMO fire control symbol range and ships marine-grade signage across Australia and to vessels in port.

Browse the full Fire Fighting Signs range for every fire control plan symbol your vessel needs, or see our Hazard Signs for ISO 7010 warning pictograms to complete your safety signage programme.

This self-closing sliding watertight fire door sign confirms the door’s self-closing watertight function, helping crew and class surveyors verify correct fitting during fire drills and inspections. See our full range of fire fighting signs for complete vessel fire safety marking.