1.double filtering effect,high effeciency and nice price 2. IIndustrial hepa air filter uses the double layer high filtering material, has the higher effeciency and longer life time.Characteristic:1.8MM-80MM pleat height2.PET,X-CROSS,NANO material, glassfibre3.Active carbon and Tio2 filter4.Antibacterial5.F5-H13 efficiency6.Customized for clients