The term 'UVnano' has been coined by compounding the words 'UV-C (ultraviolet)' and 'nanometer' (unit of length). Through the UVnano technology applied to the product, 99.9%* of airborne bacteria on fan blades can be removed for an added layer of protection.*Test Model: FS151P***(FS061PWHA), Test Date: '21. 5. 10 ~ 5. 18., Test Method: Reference test standard ISO22196:2011, Test Institution: TÜV Rheinland, KTR, Test method: Placed bacteria solution on one point of the blower fan blade, operated the for an hour, and measured the bacteria solution.(Specification reference : ISO22196:2011), Test strains: Staphylococcus aureus(ATCC 6538)/Staphylococcus epidermidis(ATCC 12228)/Klebsiella pneumoniae(ATCC 4352), Test Result: Bacteria 99.99% removal