This British Standard specifies requirements for the design, construction
and performance of aluminium alloy windows and glazed doorsets,
solid or thermally improved, intended to be installed vertically (±15°),
including constituent materials and glazing.
BS 4873:2009 history
2016BS 4873:2016 Aluminium alloy windows and doorsets. Specification
2009BS 4873:2009 Aluminium alloy windows and doorsets – Specification