Structural performance (up to)Serviceability Limit State Wind Pressure: 1800Pa maxUltimate Limit State Wind Pressure: 2300Pa maxWater Penetration Resistance Pressure: 600Pa Max maximum recommended size (up to)Height: 1250mmHeight with low light: 2000mmWidth: 600mm (sash width) Glazing - Maximum Thickness (up to) Single Glazed: 6.38mm Double Glazed: 22mm Acoustics (up to)48mm Casement Window: RW (C:Ctr): 32 (0:-1)101.6mm Casement Window: RW (C:Ctr): 35 (-1:-3)