This technical report gives details of a general scheme for the classification of such appliances according to the method of evacuating the products of combustion. It must be stressed thatThis scheme only concerns gas appliances that are intended to be installed within buildings. It does not apply to outdoor appliances. Nevertheless, it is recognised thatThis appliance classification scheme could be utilised in other circumstances. For example, in the case of: a) Appliances capable of utilising heating oil or kerosene, and b) Gas appliances intended for installation in a partially protected location external to a building.This form of appliance classification is widely used in the preparation of European Standards for gas appliances to identify the requirements and methods of test that are applicable to the various methods of evacuating the products of combustion. Appliances classified inThis way are generally described as "types" andThis description has been retained for the purposes of this general scheme. The main purpose of the scheme is to promote harmonization in the classification of appliance types.This should ensure that there is a clear understanding of the various appliance types and will avoid confusion arising from Technical Committees describing them in different ways. CEN Technical committees are therefore requested to useThis scheme in all circumstances in which it is appropriate. They should not deviate from it unless there are sound technical reasons for so doing. In the preparation of this scheme it was noted that there were methods of evacuating products of combustion that were particular to a specific Technical Committee or to a particular gas appliance. These particular methods have not been included in the present scheme because, as indicated above, the main purpose of the scheme is to promote harmonization across Technical Committees. However, it is intended thatThis scheme should be reviewed from time to time in order to consider its extension to other, possibly new, methods of evacuating products of combustion. At that time, such specific methods of evacuating products of combustion may be included at the request of the Technical Committees concerned.
PD CEN/TR 1749:2009 history
2014PD CEN/TR 1749:2014 European scheme for the classification of gas appliances according to the method of evacuation of the combustion products (types)
2009PD CEN/TR 1749:2009 European scheme for the classification of gas appliances according to the method of evacuation of the combustion products (types)
2005PD CEN/TR 1749:2005 European scheme for the classification of gas appliances according to the method of evacuation of the combustion products (types)