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
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.
Certified protection tailored to your existing architecture.
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.
Certified to DIN EN 1522–1523 with glazing per DIN EN 1063. Achieves up to FB7-NS depending on selected system.
Tested with 500 kg of explosives at 24 m distance. Certified to GSA 2 and ISO B hazard levels.
Available up to T90/EI90 and S200 classifications when SECUFIRE® steel frames are selected.
Can be mounted internally or externally on masonry, concrete or façade elements. Compatible with multiple SÄLZER systems.
Available in aluminium or steel. Finishes include primed, painted, anodised, powder coated, or clad with timber, stone, or bronze.
Dependent on selected product series. Excellent insulation values possible with triple glazing and tight seal design.
Each system tailored to site-specific needs including colour, dimensions, and integration of communication or access tech.
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.
4.1
10 Reviews
We had two Velfac windows, a large picture window, two skylights and a set of 3 sliding minimal frame doors installed. Very happy with the products but the doors are still not fully operating - 2 years on. Pro's: - Nathan, our sales contact was very well informed and provided good advice at the early stages. - Contracts and payment points were all clear - Technical drawings clear - Products are good quality and feel - Bob was quick to attend when we had a big issue after install - Good value Con's: - Builders left to interpret the window requirements - a video walkthrough together would have instilled more confidence to both parties. Even though all worked out fine. - Sliding door product is not operating due to damage arising from previous fixes. Still waiting a fix; communictions ongoing.
Super smooth experience! Everyone MFP were easy and honest to work with. The fitting team lead by Jason did an exceptional job craning our glass roof up and over the house! The glass itself is beautiful and was measured to perfection. Top work thank you all!
Absolutely delighted with our recent purchase of sliding doors for our new orangery, part of a major renovation of our home. The quality is top-notch, and the sleek design will perfectly complement our modern kitchen and frame the amazing views we have. The door’s sturdy construction and beautiful minimalist finish add a touch of elegance to the space. Highly recommend this product to anyone looking to enhance their home with stylish and functional sliding doors.