Window performance on this flush-sash windows installation in Church depends on more than the frame profile. We start with trims and coordinate internal or external trims with reveals, frame position and adjoining finishes, with trims kept as the lead check for this flush-sash windows scope. frame dimensions is then coordinated through frame proportions, sightlines, opening sizes, glazing and external finish, so we confirm manufacturing dimensions against the surveyed opening before the replacement frame is ordered, with trims kept as the lead check for this flush-sash windows scope. Before final finishing, we review frame alignment and check the frame for line, level and square before glazing and final tightening, with trims kept as the lead check for this flush-sash windows scope. We finish with hinge positions and set opening sashes so hinge direction and swing work with the adjoining room, supporting a cleaner flush-sash appearance with the installation coordinated around the existing openings, with trims kept as the lead check for this flush-sash windows scope.