Fixed single piece blade profile. Fixed blades, heads, sills and mullions to be manufactured from 1100 series aluminum alloy with 2.0mm thickness. Interior acoustic material to be 60kg/m3 density rock wool insulation protected by non-woven fire retardant 100% polyester sheeting and perforated bent sheet. Louvre pitch to be spaced at 300mm. Total system depth not to exceed 150 mm. All screws to be non-corrosive SS316.