Source and Authority   All windows will be supplied by Anglia Fixing Ltd in compliance with BS.6510 and recognised good practice to suit a design wind pressure of 1200 Pa unless otherwise specified. Performance   The windows shall meet the air infiltration, water penetration and wind loading performance criteria set out in BS.6375: Part 1 appropriate to the specified design wind pressure. Appearance   Steel profiles shall be so selected that typical perimeter sight lines of fixed lights shall not exceed 40mm. and of hinged or pivoted casements 70mm. Fixed light and casement glazing infill shall be in the same plane. Material   Profiles shall be from the W20 range, nominal width 32mm., hot rolled from mild steel to EN 10025 S235JR / DIN 17100 RST 37-2, and cold straightened. Construction   Frames shall have welded corners, dressed square and flat, and be sized within tolerances of +/- 2mm. Tee glazing bars shall be tenon riveted and/or welded to frames and interlock with rigid joints displaying face gaps of no more than 1mm. Finish   Frames and ancillary profiles shall be positively rustproofed by hot dip galvanizing to BS.729 and then polyester colour coated to BS.6497 with a minimum paint thickness over zinc on significant surfaces of 60 micrometres. Weatherseals   Ventilators shall be weathersealed with polymer rubber gaskets retained in a groove within the profile and secured by suitable adhesives. Fittings   Hinged casements have steel or brass hinges, face mounted and welded, screwed or riveted to the frame. Pivoting windows open through 90 degrees on brass cup friction pivots. A variety of handles, catches, stays and openers are available of chromed or toned brass, anodised or painted aluminium, and chromed or painted zinc alloy. Double fasteners will be fitted on ventilators over 1200mm long or 1500mm high. Fixing   Windows will be supplied with rustproofed screws, plugs, and/or lugs to suit specified builder's openings. Composite assemblies will be delivered in separate units to be coupled together on site by those responsible for fixing. When contracted to install, the manufacturer shall apply appropriate external perimeter sealants. Glazing   Windows will be glazed on site, from inside or outside, with single glass or insulating glass units up to 14mm. thick, using factory finished beads, bedding and capping sealants in accordance with BS.8000: Part 7.