This International Standard specifies the co-ordinating sizes for doorsets of all materials to be used in buildings, and which will fill co-ordinating spaces in dimensionally co-ordinated buildings. lt is based on the principles of modular Co-Ordination, and is in accordance with the ISO documents listed in the Foreword. NOTE - This International Standard gives a range of sizes limited to those which have been accepted by Member Bodies (national Standards may include additional sizes). Notice will be taken of experience in the use of all these sizes when considering a revision of this International Standard. 1 )