This European Technical Specification defines terms concerned in all standardisation work within the scope of CEN/TC 295. According to CEN/TC 295 this European Technical Specification is applicable to residential heating appliances fired by solid fuels. As regard to the NOx and OGC/total hydrocarbons emission test methods, the user shall refer to other European Standards or to national documents for input data and detailed calculation procedures not provided by this TS. For those countries that currently have a test method for particulate and dust emissions the user should refer to the national documents of that country, whilst for those countries that do not have a specific test method, the user may choose one of those listed in the Annex to this TS.