This paper documents a research program in which a measurement system was developed for the analysis of air flow through automotive air filters. The measurement sensor was based on the use of thermochromic liquid crystal paint and nichrome wire as a heater element. This paper incorporates results of tests carried out on filter paper using the developed measuring system. The examined filter paper was used for primary air intake combustion engine filters. Holes, in the range 50 μm to 2.35 mm were made in the filter paper using an excimer laser and air flow through the filter paper was examined. The visual patterns of air flow are compared and presented herein.