The HVAC components are usually made of galvanised sheet metal which is covered by a corrosion protection and also lubricant oils are used in machine tools in manufacturing of the components or ducts. The aim of this study was to test and develop a consistent method to determine oil concentrations on component surfaces. Two swiping methods and a filter contact method were tested. In al of them the analysis based on IR-spectrometry. The results show that oil concentration is quite high and unequally distributed on the surface of the sheet metal containing corrosion protection oil. The concentrations were low on the sheets treated with chromium acid. The filter contact method showed the best recovery 91% (2% while the recoveries were 55-65% with the swiping methods. the detection limit for the filter contact method was 4mg/m2 and 1mg/m2 for the others.