... drop:450 PaMoisture resistance<100% RHGuangzhou AK Filter Co.,Ltd has been dedicating ourselves to filter products since ... jiangsu and zhejiang provinces.In 1975,Tiantai factory was established,and had purchased import production equipment.In 1994,Guangzhou Longhuilong filter Co., ltd ... office was established.In 2006,Guangzhou AK filter Co.,Ltd. was established. Nearly one hundred years development, ...