Evolution of Fire Shutter Design
Single-Panel Steel Fire Shutters
Early steel fire shutters featured a single-plate design. Their curtains were typically formed by linking steel strip sheet made from 0.5–1.5 mm thin steel plates, cut and rolled into shape. These single-plate steel shutters offered advantages like simple structure, high strength, wind resistance, security, good plasticity, and ease of manufacturing, installation, and use. However, their fire resistance and thermal insulation performance were relatively poor.
Composite Steel Fire Shutters
Through ongoing research, manufacturers developed composite steel fire shutters, now commonly used in China. Structural improvements allow these to retain the benefits of single-plate shutters while significantly enhancing thermal insulation. Their curtain consists of composite sandwich panels – two layers of thin steel strips encasing a layer of inorganic fiber insulation material (such as rock wool, mineral wool, fiberglass, or aluminum silicate fiber). The low thermal conductivity of these inorganic fibers substantially improves the shutter's insulating properties compared to single-plate versions.
RHIDOOR Custom-Made Composite Steel Fire Shutters
RHIDOOR's custom-made composite steel fire shutters are produced by press-forming the main and auxiliary shutter plates in a single process, resulting in a smooth surface, no welding seams, and high strength. The core is filled with flame-retardant insulation, greatly reducing heat radiation on the non-fire side. These shutters offer extended fire resistance and superior performance, potentially eliminating the need for water curtain protection systems. They meet the separation requirements for various Class A fire zones. Electrically operated vertical steel fire shutters can be integrated with automatic and linked controls from a central fire control room.
Fire Resistance Testing and Quality Standards
Fire shutters must possess high fire resistance strength and duration at the incident site, demanding high manufacturing standards where the entire system withstands high temperatures for a specified period. Consequently, the fire resistance duration is a primary indicator of a shutter's qualification. In large buildings with central fire control systems (as required by fire codes), smoke detectors on the ceiling trigger an alarm upon sensing smoke. The system identifies the fire zone and powers the corresponding shutters, initiating their descent at a set speed. The shutter stops approximately 1.5 meters above the floor to allow for occupant evacuation, pauses for a predetermined time, and then continues closing completely.
Applications and Benefits
Fire shutters serve to compartmentalize buildings into fire zones, meeting fire safety codes by acting as barriers against smoke and flames instead of firewalls, thus preventing fire spread. They typically provide up to 3 hours of fire containment. They are often installed in large spaces where fitting standard fire doors is difficult. Common application areas include:
- Underground parking garages
- Hotel atriums
- Shopping malls
- Industrial buildings with potential explosive atmospheres
Fire and water are merciless. In a fire, every second counts for survival. Fire shutters, by curbing the spread of flames, buy precious time for escape. They effectively reduce economic losses and safeguard lives.