Dongguan Huashengyi Environmental Purifying Technology Co., Ltd. E-mail: sales@hsy-airfilter.comTo Allen: sales01@hsy-airfilter.com E-mail: HSY_waimaobu@126.com Wechat & WhatsApp: +86 13266187584 (Allen) Whatsapp: +86 18985272474 Address: No.113 new anyuan road, dongcheng district, dongguan city, China.