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)