Closing Appliance for Ventilation Inlet/Outlet Sign

Closing Appliance for Ventilation Inlet/Outlet Sign – IMO A.654(16) Fire Control Symbol FS0244

This Closing Appliance sign identifies a fire damper or shut-off flap fitted to an external ventilation inlet or outlet, used to seal off a duct opening and stop the spread of smoke or fire between compartments. The pictogram shows the standardised red flap closing downward over a duct opening, matching exactly what appears on the vessel’s fire control plan for this location. As SKU FS0244 in the Fire Fighting Signs range, it is designed for permanent fixing beside ventilation closing appliances in machinery spaces, accommodation trunking, engine room casings and other areas where ducted ventilation penetrates fire-rated boundaries.

A closing appliance lets crew or automatic systems isolate a ventilation duct quickly during a fire, cutting off the airflow path that would otherwise feed oxygen to a blaze or let smoke travel between spaces, which makes fast, confident location of every closing appliance critical during a genuine incident. Clear signage also supports routine fire equipment rounds, where crew confirm every damper and shut-off flap remains accessible, undamaged and correctly matched to the vessel’s ventilation closing plan. The photoluminescent background of this sign keeps the closing appliance identifiable during a blackout, exactly when isolating ventilation may be the only way to contain a developing fire.

Why Closing Appliance Identification Matters

Crew responding to a fire need to isolate the correct ventilation duct without delay, since an open inlet or outlet left unclosed can pull smoke and fire through accommodation and machinery spaces far from the original source. Correctly signed closing appliances also support fire drills and equipment familiarisation, helping new crew learn the layout of the ventilation isolation system across engine rooms, accommodation blocks and cargo spaces. This distinction matters particularly on vessels with extensive ducted ventilation, where multiple closing appliances may be spread across several decks and require rapid identification during a drill or real emergency.

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 ventilation closing appliances. SOLAS Chapter II-2 sets requirements for ventilation systems serving machinery spaces and accommodation areas, including the means of closing them off to prevent the spread of fire and smoke, and correctly labelled closing appliances are part of demonstrating that this equipment is genuinely in place during Port State Control inspections and class surveys. Fitting SKU FS0244 keeps your ventilation signage matched to the fire control plan surveyors will reference.

Installation Recommendations

Fix this sign directly above or beside the ventilation closing appliance, using the pre-drilled fixing holes for a permanent mechanical fixing or the self-adhesive backing on smooth painted surfaces. In machinery spaces and ducting runs exposed to vibration, heat and oily residue, a screw or rivet fixing will outperform adhesive over the vessel’s operating life, and the sign should remain visible even when insulation or lagging is fitted nearby. Check the sign periodically during routine fire equipment rounds to confirm it remains legible and the closing appliance beneath it operates freely.

• Standard IMO/ISO 17631 fire control symbol – red closing flap over ventilation duct pictogram
• 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 machinery space and ducting use
• Matches fire control plan symbols exactly for fast, confident equipment identification

Order the FS0244 Closing Appliance sign to keep every ventilation isolation point on your vessel clearly identified before your next drill or inspection. 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.