scope:

Specifies the additional requirements and test methods for gas-fired air heaters which are so designed that water vapour condenses from combustion products. Applies to gas-fired air heaters with or without a fan in the combustion circuit in one of the following constructional types: - an integral air heater with at least one condensing heat exchanger;- a non-condensing air heater with an integrated additional condensing heat exchanger;- a non-condensing air heater, with an integrated additional condensing heat exchanger for the recovery of heat from combustion products and from ventilation air if appropriate. Covers type-testing only.