Window performance on this restricted-opening windows installation in Kensington depends on more than the frame profile. We start with packers and support the frame at suitable points so fixing does not pull it out of line. opening configuration is then coordinated through restrictor type, opening angle, handle operation, frame fixing and user access, so we confirm fixed and opening sections against ventilation, access and furniture or worktop positions, with packers kept as the lead check for this restricted-opening windows scope. Before final finishing, we review gaskets and check glazing and sash seals for continuous seating before final handover, with packers kept as the lead check for this restricted-opening windows scope. We finish with opening survey and check the existing opening, frame position and surrounding finishes before final dimensions are confirmed, supporting windows that retain practical ventilation while limiting the opening range, with packers kept as the lead check for this restricted-opening windows scope.