FB3, FB4 & FB4+ Bullet-Resistant Roller Shutter | RC3 & RC4

Advanced Ballistic Protection and High-Security Engineering

The SUNON Custodia Bulletproof is a high-security roller shutter system developed to protect buildings, access points and facilities requiring enhanced resistance against ballistic impacts and forced-entry attempts.

Engineered to combine protection, structural strength and architectural integration, the system incorporates high-strength extruded aluminium profiles and an internal armouring system that varies according to the required level of protection.

The Custodia Bulletproof range is available with different levels of ballistic resistance: FB3, FB4 and FB4+, as well as RC3 and RC4 burglary-resistance configurations, depending on the technical specifications of each project.

Its design allows enhanced protection to be integrated into façades and architectural openings without the need for visually intrusive security barriers.

Ballistic Protection — FB3, FB4 and FB4+ Versions

The Custodia Bulletproof incorporates an internal armouring system specifically developed to provide resistance against ballistic impacts.

Its construction combines an extruded aluminium outer profile with different armouring materials, selected according to the required ballistic protection level.

FB3 — Ballistic Protection

This version incorporates solid internal aluminium profiles manufactured from a special alloy, providing FB3 ballistic resistance as specified in the system’s technical documentation.

FB4 — Reinforced Ballistic Protection

A configuration featuring RAMOR 500 internal armour, designed to provide a higher level of ballistic resistance.

FB4+ — Advanced Ballistic Protection

This version incorporates RAMOR 600 internal armour, developed for projects requiring enhanced protection compared with the previous configurations.

The internal armoured profiles are designed to overlap, helping to minimise potential vulnerable points between the slats.

The ballistic performance of each version applies to the configurations covered by the relevant testing documentation and corresponding installation conditions.

Burglary Resistance — RC3 and RC4 Configurations

In addition to ballistic protection, the Custodia Bulletproof can incorporate RC3 and RC4 burglary-resistance configurations, depending on the security requirements of each project.

The system is engineered to increase resistance against forced-entry attempts involving hand tools and other forms of mechanical attack.

Its construction incorporates:

• Extruded aluminium profiles with structural reinforcements.
• Reinforced interlocking hooks between slats.
• Semi-curved profile geometry to improve dimensional stability.
• Lateral guide rails adapted to the required resistance level.
• Locking and retention systems according to the selected configuration.
• Optional additional security components.

The applicable burglary-resistance classification must be verified against the specific system configuration and corresponding test documentation.

Structural Engineering — Extruded Aluminium and Internal Armour

The Custodia Bulletproof combines an outer structure manufactured from 6063 T5 extruded aluminium with internal armoured profiles selected according to the required ballistic resistance level.

The external profiles feature a semi-curved geometry measuring 39 × 14 × 1.30 mm, with reinforcement thicknesses of up to 1.55 mm in the supporting ribs.

The system incorporates approximately 26 slats per linear metre of height, with reinforced interlocking connections and metal fixing components designed to improve overall structural stability.

The slat geometry helps minimise deflection across wide openings while allowing a compact rolling diameter relative to the system’s structural characteristics.

The overlapping internal armour is designed to maintain protective continuity between the individual profiles forming the shutter curtain.

Weight and Configuration According to Armour Level

The different Custodia Bulletproof versions have specific weights depending on the internal armouring materials.

According to the technical catalogue:

• FB3: approximate weight of 36 kg/m².
• FB4: approximate weight of 53 kg/m².
• FB4+: approximate weight of 57 kg/m².

These weight differences influence the dimensioning of the shafts, guide rails, motorisation systems and safety components.

Each project requires an individual technical assessment to determine the most suitable configuration based on the opening dimensions, required protection level and installation conditions.

Reinforced Guide Rails and Support Systems

The Custodia Bulletproof is compatible with different types of lateral guide rails, selected according to the shutter dimensions, building characteristics and required resistance level.

Options described in the technical catalogue include:

• 50 × 30 mm guide rails.
• 60 × 28 × 2 mm guide rails.
• V25-type guide rails for smaller openings.
• Fixing and retention systems adapted to the structural loads.

The shafts are dimensioned according to the weight of the armour and the characteristics of the opening, with different diameter and wall-thickness options available.

Correct selection of the guide rails, anchoring systems and structural components is essential to ensure proper operation and the intended security performance.

Motorisation, Automation and Security System Integration

The Custodia Bulletproof can incorporate tubular motorisation systems adapted to the weight and dimensions of the shutter.

The technical documentation includes:

• Tubular motors with mechanical or electronic limit switches.
• Radio control systems with rolling-code technology.
• Bidirectional remote controls.
• Integration with building automation systems.
• Compatibility with KNX control solutions or open protocols, depending on the selected equipment.
• Connection to alarm systems and perimeter security sensors.
• Optional electronic locking systems.

Depending on the shutter weight, installation location and operating conditions, additional safety devices, such as anti-fall mechanisms or protective sensors, may be required.

Applications in High-Security Projects

The Custodia Bulletproof is particularly suitable for projects where ballistic protection and resistance against forced entry are essential requirements.

Typical applications include:

• Government buildings and institutional facilities.
• Banks and financial institutions.
• Infrastructure requiring enhanced security measures.
• Private residences requiring ballistic protection.
• Corporate headquarters and commercial buildings.
• Access points and openings in sensitive areas.
• Architectural projects requiring discreet integration of armoured security systems.

The final configuration must be adapted to the risk assessment and protection requirements of each installation.

Architectural Integration and Custom Finishes

Despite incorporating internal armouring systems, the Custodia Bulletproof is designed to maintain a discreet external appearance compatible with contemporary architecture.

The system can be visually combined with other models from the Custodia range, allowing a consistent façade appearance across openings with different security requirements.

The technical documentation includes:

• RAL powder-coated finishes.
• Special finishes from the Futura range.
• Anodised finish options.
• Different shutter box solutions and installation configurations.

Custom manufacturing allows the system to be adapted to the architectural and functional characteristics of each project.

SUNON — Ballistic and Architectural Protection Engineering

With more than three decades of experience, SUNON develops technical roller shutter and security systems that combine engineering, mechanical resistance and architectural integration.

Our expertise in extruded aluminium profiles, armouring systems, automation and protective solutions enables us to collaborate with architects, engineering firms, security integrators and project managers on demanding high-security projects.

Each installation requires an assessment of the opening dimensions, ballistic resistance requirements, burglary-resistance classification and installation conditions to determine the most suitable system configuration.

CUSTODIA BULLETPROOF: FB3, FB4 and FB4+ ballistic protection, RC3 and RC4 burglary resistance, and security engineering tailored to each project.

For technical documentation, project-specific configurations or a quotation, please contact our technical department.