This completely new Standard applies to the fast growing market in flueless portable and fixed radiant outdoor radiant gas heating intended for use in outdoor areas. These heaters are for use with natural gas, town gas, liquefied petroleum gas (LPG) or tempered liquefied petroleum gas (TLP) with gas consumption not exceeding 70 MJ/h. They may be suspended overhead, angle mounted overhead, wall mounted overhead, free standing, portable, fixed, floor mounted, or built into furniture or fixtures, connected to a fixed fuel piping system or to an integral LPG supply system. The Standard sets down the requirements for those designing and manufacturing external gas heaters and also includes clear and extensive requirements for instructions and labelling. These latter requirements are particularly important for the 'patio heater' type of appliance. A clear definition is also given for outdoor areas in which it is intended that these appliances be used.