Residential air filters have different functions such as antibacterial and odor, which can be used for air purification in residential environment. Youjie specializes in the production of air filters and other air cleansing products. Youjie passed ISO9001-2008 quality management system certification and ISO 9001:2015 quality management system certification. We strictly follow ISO9001 quality management system requirements during production processes in order to maintain a high level of product quality.