• CosaTron is a unique and patented system that does not generate ozone, ionization, or high frequency interference. CosaTron is not an air filter. It is applied in combination with an air filter to enhance the performance of the filter. • Applying CosaTron to meet ASHRAE 62 allows the system designer to reduce the use of outside air while controlling all types of contamination, thus increasing human efficiency by restoring fresh, cleaner air where we live and breathe.