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This Standard specifies the conditions for laboratory testing of atomizing oil burners of the monobloc type, with a flow rate m of ≤ 100 kg/h and supplied with a fuel having a viscosity at the burner point of (5.5 Â± 0.5) mmÂ² /s at 20Â°C. These tests are normally carried out in the combustion chambers defined in paragraph 6.3. In certain special cases, however, they may be carried out in a heat exchanger for which the burner has been specifically designed. These test conditions are not applicable to burners which are part of a burner-heat exchanger unit, constituting a heat generator unit, as in that case it is the whole assembly which is tested.