DS EN 303-1:1999
DS EN 303-1:1999 Heating Boilers - Part 1: Heating Boilers With Forced Draught Burners - Terminology, General Requirements, Testing And Marking Pertains to heating boilers with burners using fans up to a nominal heat output of 1000 kW. They are operated, either with negative pressure (natural draught boiler) or with positive pressure (pressur