Qifan Environmental Technology(Shanghai) Co., Ltd. is a company integrating industry and trade. Specializing in the air purifier filter field for nearly 8 years. We have a strong supplier of raw materials. Quality is our guarantee.Our eternal management concept is quality service and good faith.The efficiency grade of air purifier filters is from low to HEPA 14 grade (MERV 19) according to EN779, EN1822 and ASHRAE.And our technical department is ready to develop any new air filter item for residential, commercial and industrial use.Accepted OEM & OGM.