As a result, Froumann N90 model air cleaning device was determined to be effective in controlling and effectively reducing the microbial load in the environment. When the air purifier is operated at the 3rd and 5th levels, the decrease in the microbial load and the number of particles is determined to be close. In addition, with the Froumann N90 model air purification device, it was determined that both the microbial load of an environment in normal conditions and the microbial load in the environment when increased can effectively clean the microorganisms in the air. In studies conducted simultaneously with the particle measuring device, a correlation was found between the number of particle sizes of 0.3 μm diameter and the microbial load, and the results of both tests are complementary.

Due to the COVID-19 epidemic, which includes the world and our country, the criteria such as increasing the air quality and cleaning the ambient air have increased especially in the public living areas. In our daily life, the use of medical masks has been made compulsory and these masks are expected to prevent 98% microbial passage according to the relevant standards. Controlling the microbial load of the ambient air is just as important as the masks. The analysis done with the Froumann N90 model air cleaning device showed that the microbial load in the ambient air was kept clean by the device at a value between 85-99%.