High-security aluminium windows engineered for police stations, prisons, courts, and forensic clinics. The METAS® system combines protection against escape, suicide, and vandalism with a grille-free design that promotes rehabilitation and safety.
Tested resistance to break-ins and escape attempts up to RC4 (fixed) and RC3/RC4 (opening units)
No window grilles required – improved rehabilitation environment
Suicide prevention design with concealed hardware and tamper-proof locking
Vandalism-resistant glazing beads and sash construction
Tested up to 20,000 cycles with sash weights of 350 kg
Flush, rounded design to eliminate ligature risks
Engineered for extreme protection in high-risk environments
The METAS® window series is developed specifically for environments where safety, control, and human dignity must coexist. It provides resistance against escape from the inside and assisted break-ins from the outside, certified up to RC4 levels.
What sets the METAS® system apart is its unique grille-free security design. With solid vent profiles, flush-fitted glazing beads, and concealed hardware, the windows eliminate suicide risks while ensuring robust physical security.
Ideal for holding cells, forensic institutions, and secure medical facilities, METAS® combines discretion with dependability. Its compatibility with various wall structures and tamper-proof features makes it a reliable long-term solution.
Tested security and durability under extreme conditions
Certified to DIN EN 1627–1630: Fixed glazing up to RC4 inside and out, opening units up to RC3 (inside) and RC4 (outside). Glazing up to P7B for enhanced protection.
Concealed hardware and tamper-proof design with no handles on inmate side. Rounded, flush sashes and secure glazing prevent removal or injury.
Uw values from 1.4–1.7 W/m²K (double glazing) and 0.8–1.5 W/m²K (triple glazing). Acoustic performance up to Rw 45 dB.
Lifecycle tested to 20,000 open/close cycles with sash weights up to 350 kg, ensuring long-term reliability in secure environments.
Wind load resistance up to Class C5 (2000 Pa), watertightness up to E 900 (900 Pa), and air permeability Class 4 (600 Pa).
Available in anodised or powder-coated aluminium. Slimline profiles maintain discreet aesthetics despite high security functionality.
Tested for multiple substrates including concrete and masonry. Adaptable to existing structures with security-specific fixings.
Ideal for prisons, police holding cells, courts, forensic psychiatric units, and military buildings. Supports both internal and external use.
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.