Activity and products Hepafan, Hepa filter, air cleaner, air purifier #Company History 2014 10 Dartech was founded and awarded the "Venture Business" certificate. 2015 Developed floor cleaners and LED lights. 2016 Developed photocatalyst filters. 2017 09 Developed and marketed photocatalyst-applied air cleaners for cars. Launched the trademark "Air Caf?". 2018 04 Changed its ownership structure to a limited liability company. 06 Developed electric fan-attached, air-cleaning "HEPA fans". 07 Entered into an investment agreement with Baos. 09~ HEPA fans are now on sale on- and off-line, as well as on home shopping TV. #Main Products : Hepafan