You’re Currently on Our Commercial Website.
Would you like to switch to our Residential Website to explore tailored glazing solutions for homeowners?
Secondary Window Systems
Achieve high-level protection without replacing existing windows. SÄLZER’s secondary systems offer certified resistance to forced entry, ballistic attack, blasts, and fire—perfect for listed buildings or temporary security upgrades.
Retrofit solution for enhanced security
Maintains exterior building appearance
Protection against burglary, bullets, and blasts
Ideal for listed or architecturally sensitive buildings
Optional fire and smoke resistance with steel options
Compatible with S1es, S2es-w, S6es-w, and SECUFIRE® systems
External or internal installation available
Customisable finishes: powder coated, anodised, or timber clad
Time-efficient and cost-effective upgrade
Upgrade Security Without Replacing Windows
Discreet, high-performance protection for retrofit and heritage applications.
SÄLZER’s secondary window systems provide a smart, non-invasive way to elevate building security. Designed for use with existing windows, they deliver robust protection against forced entry, bullet impact, and blast threats.
Whether installed internally or externally, these systems are ideal for high-security environments where aesthetics must be preserved—such as embassies, government buildings, and listed properties.
With optional integration of fire and smoke resistance (when using the SECUFIRE® steel system), this solution ensures compliance with even the most demanding project requirements—without the need for full window replacements.
Technical Specifications
Certified protection tailored to your existing architecture.
Forced Entry Resistance
Tested to DIN EN 1627–1630 standards. Levels vary based on selected system: S1es aluminium façade, S2es-w and S6es-w aluminium windows, SECUFIRE® steel systems.
Bullet Resistance
Certified to DIN EN 1522–1523 with glazing per DIN EN 1063. Achieves up to FB7-NS depending on selected system.
Blast Resistance
Tested with 500 kg of explosives at 24 m distance. Certified to GSA 2 and ISO B hazard levels.
Fire & Smoke Resistance
Available up to T90/EI90 and S200 classifications when SECUFIRE® steel frames are selected.
Installation Options
Can be mounted internally or externally on masonry, concrete or façade elements. Compatible with multiple SÄLZER systems.
Materials & Finishes
Available in aluminium or steel. Finishes include primed, painted, anodised, powder coated, or clad with timber, stone, or bronze.
Thermal & Acoustic Performance
Dependent on selected product series. Excellent insulation values possible with triple glazing and tight seal design.
Customisation
Each system tailored to site-specific needs including colour, dimensions, and integration of communication or access tech.
What Our Customers Say
We take pride in delivering exceptional glazing solutions and outstanding customer service. Here’s what some of our happy clients have to say about working with Minimal Frame Projects.