This European Standard specifies the requirements and test methods for the rational use of energy of non-domestic gas-fired overhead luminous radiant heaters for environmental comfort, incorporating an atmospheric burner system referred to in the body of the text as “appliances”.This European Standard is applicable to Type A1 appliances only (see 4.3).This European Standard is not applicable to:a) appliances designed for use in domestic dwellings;b) outdoor appliances;c) appliances of heat input in excess of 120 kW (based on the net calorific value of the appropriate reference gas);d) appliances having fully pre-mixed gas and air burners in which:1) either