Main Vertical Zone Division Sign

Main Vertical Zone Division Sign – IMO A.654(16) Fire Control Symbol FS0224

This Main Vertical Zone Division sign marks the exact line of an A-class fire boundary bulkhead that divides the vessel into separate main vertical zones, one of the fundamental structural fire protection measures required on passenger and cargo vessels alike. The pictogram shows a simple vertical red bar on a photoluminescent background, the internationally standardised symbol used on fire control plans to indicate where one main vertical zone ends and another begins. As SKU FS0224 in the Fire Fighting Signs range, it is designed for permanent fixing at deckheads, bulkheads and other structural boundaries that form part of the vessel’s main vertical zone division.

Main vertical zones exist to contain fire and smoke within a limited section of the ship, giving crew time to fight a fire and passengers or crew time to reach muster stations without an incident spreading uncontrolled through the entire vessel. A clearly marked zone boundary lets fire parties immediately understand which side of a division they are operating on, and lets damage control teams confirm that boundary bulkheads, doors and penetrations are being correctly maintained as fire barriers. The photoluminescent background of this sign also keeps the zone boundary visible during a blackout, when maintaining zone integrity becomes even more critical to containing an incident.

Why Main Vertical Zone Division Matters

The entire structural fire protection strategy on a SOLAS vessel depends on main vertical zone boundaries remaining intact and clearly understood by the crew responsible for maintaining them, since a compromised boundary can allow fire and smoke to spread far beyond the zone of origin. Clearly signed divisions support fire drills, damage control training and day-to-day awareness of where structural fire boundaries actually run, which is not always obvious from the general arrangement of a ship’s interior. This matters particularly for crew standing fire watches or conducting rounds, who need to recognise zone boundaries even when relying only on the fire control plan and physical signage.

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 exactly what flag-state surveyors and classification societies expect to see marking main vertical zone divisions. SOLAS Chapter II-2 sets out detailed requirements for main vertical zones, including their maximum length and the fire integrity of their boundaries, and correctly marked divisions are part of demonstrating that structural compliance during Port State Control inspections and class surveys. Fitting SKU FS0224 keeps your zone boundaries matched to the fire control plan surveyors will reference.

Installation Recommendations

Fix this sign at deckhead or bulkhead level directly on the line of the main vertical zone boundary, using the pre-drilled fixing holes for a permanent mechanical fixing or the self-adhesive backing on smooth painted steel surfaces. In alleyways and public spaces, position the sign where it remains visible to crew and passengers moving through the area, and in machinery or store spaces a screw or rivet fixing will outlast adhesive in humid or oily conditions. Check the sign periodically during routine rounds to confirm it remains legible and still accurately marks the zone boundary shown on the fire control plan.

• Standard IMO/ISO 17631 fire control symbol – vertical bar pictogram marking zone boundaries
• Photoluminescent base for visibility during blackout or power failure
• 150x150mm rigid or self-adhesive format to suit steel, aluminium or GRP surfaces
• UV-stable, corrosion-resistant construction for long-term interior and exterior use
• Matches fire control plan symbols exactly for fast, confident zone recognition

Order the FS0224 Main Vertical Zone Division sign to keep every structural fire boundary on your vessel clearly marked 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.