This European Standard describes the test method and the test installation for determining the thermal out-put of ceiling mounted heating surfaces according to the specifications 3.1, 3.2. and 3.3. This part applies to determine thermal output when chilled ceilings according to EN 14240 are also used for heating. NOTE Test results according to this part cannot be compared with results according EN 14037 2 because great discrepancies are given at open ceilings, convective components and heating surfaces without upper insulation.