This European Standard specifies the requirements and test methods for the construction, safety, rational use of energy, classification and marking of non-domestic gas-fired overhead luminous radiant heaters for environmental comfort, referred to in the body of the text as appliances . This European Standard is applicable to Type A1 and Type A3 appliances only (see 4.2.2) intended for use in other than residential dwellings: a) low gas pressure appliances operating at pressures up to and including 50 mbar; b) medium gas pressure appliances operating at pressures above 50 mbar and up to 2 bar. This European Standard is not applicable to: appliances designed for use in domestic dwellings; outdoor appliances; appliances of heat input in excess of 120 kW (based on the net calorific value of the appropriate reference gas); This standard is applicable to appliances which are intended to be type tested.