Structural performance (up to) Serviceability Limit State Wind Pressure: 1800Pa max Ultimate Limit State Wind Pressure:2300Pa max Water Penetration Resistance Pressure:600Pa Max maximum recommended size (up to) Height: 1250mm Height with low light:2000mm Width: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)