Not only air, but also the radioactive radon can penetrate rooms through leakages in the building envelope and accumulate there if ventilation is poor. Because increased radon concentration is the second most common cause of lung cancer, the EU has set a uniform reference value for the limitation of radon. So far, solid values could only be obtained with long-term measurements of 3 – 12 months. A reliable new method for the short-term inspection came with the Rn50 test. Therefor a BlowerDoor system is used to generate negative pressure in the part of the building to be examined and a constant radon concentration is determined via the supply air of the measuring fan with a suitable radon measuring device.

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