This British Standard specifies requirements for the design, construction and performance of aluminium alloy windows intended to be installed vertically, including materials and glazing.
It is applicable to the following window types, which can be in multi-light form:
a) hinged-side-hung (open in or out), top-hung (open out), bottom-hung (open in), tilt and turn;
b) projecting-side-hung (open out or reversible) and top-hung (open out or reversible);
c) pivoted-horizontal and -vertical (hung centrally or off-centre including reversible);
d) sliding-horizontal and -vertical (including tilting sash to vertical);
e) fixed lights;
f) louvred-adjustable.
It is also applicable to windows that are used for replacement purposes and those that have thermally improved frames.
It is not applicable to:
1) windows in which any frame member is longer than 3 m;
2) fixed louvres;
3) secondary windows applied to convert existing single windows into double or coupled windows;
4) windows with frames designed to be glazed with security glazing conforming to BS EN 1063 or BS 5544;
5) the thermal properties of thermally improved frames.
NOTE Advisory notes on materials and construction are given in Annex A, and details of optional features to be agreed between the manufacturer and the purchaser are given in Annex B.
BS 4873:2004 history
2016BS 4873:2016 Aluminium alloy windows and doorsets. Specification
2009BS 4873:2009 Aluminium alloy windows and doorsets – Specification