As a professor in air purification industry, Dongguan Hongyuan Purification Equipment Co., Ltd devoted itself to developing high efficiency air filter replacement and high-tech air purifiers. Hongyuan is approved by ISO9001 and ISO14001 in 2015, now it has more than 15 patents. 
    Not only manufacturing various filter replacement, Hongyuan also provide ODM service. Whatever size or package you want, we can make it out, both pre filter cotton and activated carbon material are passed CE certification, and we will have quality control before shipment.