Pressure drop of air filter during dust clogging period and related test method

Carries out the comparative experiments testing the pressure drop of the same air filter with ASHRAE test dust and atmospheric dust fed respectively, and the experiments testing the pressure drop of the air filters with different filtering-level fiber media. The results show that ASHRAE test dust, easier to clog on the surface of filtering fibers, has the better effect of simulating atmospheric dust before clogging; that the higher filtering-level of fiber media, the severer clogging is; and that the pressure drop of filtering fibers decreases significantly after shaking. The current test method of ASHRAE test dust needs to be improved to make the laboratory test results using ASHRAE dust to agree well with those in actual situation with atmospheric dust.