This standard applies to electric direct-acting room heaters. They may be portable, stationary, fixed, or built-in. It does not apply to: – thermal-storage room heaters (IEC 60531); – heating appliances incorporated in the building structure; – central heating systems; – heaters connected to an air duct; – wall-paper, carpets or drapes incorporating flexible heating elements. This standard defines the main performance characteristics of direct-acting room heaters and specifies methods for measuring these characteristics, for the information of users. This standard does not specify values for performance characteristics. NOTE – This standard does not deal with: – safety requirements (IEC 60335-2-30); – acoustical noise of fan heaters (IEC 60704-2-2)