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This document specifies the requirements and test methods for the safety and efficiency of gas fired air heaters with or without a fan to assist the transportation of combustion air and/or flue gases. This document also applies to warm air heaters having forced draught burners. This document applies to Type A2, A3 appliances, with an input not exceeding 300 kW (net CV basis), intended for non-domestic use. This document also applies to Type B11, B11AS, B11BS, B12, B12AS, B12BS, B13, B13AS, B13BS, B14, B14AS, B14BS, B22, B23, B41, B41AS, B41BS, B42, B42AS, B42BS, B43, B43AS, B43BS, B44, B44AS, B44BS, B52, B53, C11, C12, C13, C21, C31, C32, C33, C41, C52, C53, C62 and C63 appliances with an input not exceeding 300 kW (net CV basis), intended for domestic and non-domestic use. The heated air can be delivered by means of ducting. This document applies only to appliances using the gaseous fuels of the second and third families as defined in EN 437. For second family gases, this includes H2NG blends containing up to 20 % hydrogen by volume, where the appliance is marked with the appropriate extended category (e.g. I2H, I2E, I2E(Y20)). This document does not apply to appliances intended to burn gases containing carbon monoxide or other toxic components. This document does not apply to: a) dual purpose air conditioning appliances (heating and cooling); b) appliances where the air is heated by an intermediate fluid; c) portable or transportable forced convection appliances; d) appliances fitted with manual or automatic means of adjusting the combustion products evacuation by means of flue dampers; e) appliances having multiple heating units with a single draught diverter; f) appliances fitted with more than one flue outlet; g) appliances fitted with gas boosters; h) C21 and C41 appliances for 3rd family gases. NOTE 1 Appliance Types (A, B and C) are classified in accordance with EN 1749. NOTE 2 For C41 appliances, see all requirements and test methods that are valid for C21 appliances, unless otherwise stated.