flexible, economical and easy to install. Will not crease, dent, or unravel. Fiberglass Window Screen is rust and corrosion re Built to withstand a very wide range of forces: the Standard high-grade steel roller shutter slat, which is roll-formed from a special high-grade steel alloy and filled with a heavy-duty twocomponent composite material, fulfils the most demanding of safety and security requirements. It can withstand wind loads up to resistance class 6 with unit widths up to 4,200 mm and increased burglary resistance up to WK 3.Energy-savingTotal U factor value improvement of up to 44 percent incombination with thermally insulated heroal windowsSecurityAvailable with resistance class up to WK 3Wind resistance class 6 with unit widths up to 4,200 mmHigh-grade steel profile with foam filling made of two-component composite material SoundproofingOptimised sound insulation: +10 dBDesignCoverage width: 53 mmMax. width / height: 6,000 mm / 4,000 mmMax. area: 18.0 m²Finished curtain weight: 18.0 kg / m²