TAC is custom air purifier that can stack filters at the top of air purifier. Because there are so many elements can effect to our health around our home, TAC can supply Filters which can protect each 7 environments around us (such as pet allergy, flower allergy, yellow dust,...) to customers . If there are many flowers around your home, you may have problems about pollen. In that case, you can add the flower allergy filter at the TAC. Like this, you can choose and combine 3 filters fit to home among the whole filters. The experience that buying the filters can provide to customer that they think carefully about health and environments.