Af55014+AF55308

The filtration efficiency is more than 80%. The second stage is a microporous paper filter element (generally called the main filter element), which has a filtration efficiency of more than 99.5%. There is also a safety filter element after the main filter element, which is used to prevent dust from entering the engine when installing and replacing the main filter element or when the main filter element is accidentally damaged. The material of safety core is mostly nonwovens, and filter paper is also used.