①Prepare a compressed air source on the outside of the tested facility and connect the aerosol generator (cold generator) to the upstream suction port of the high-efficiency filter. The input pressure of compressed air remains greater than4 kg/cm3In the normal state, turn on the fan to allow the aerosol mixed with the supply air to enter the upstream of the high-efficiency filter in the tested facility and stabilize for a period of time. Ensure aerosol（PAO）Uniformly distributed upstream of the high-efficiency filter.

② Open aerosol（PAO）Spectrophotometer until stable aerosol is obtained（PAO）Establish upstream concentration values100%Upstream concentration benchmark;Aerosol（PAO）The upstream concentration is not less than20 Mg/L.

③ Using aerosols（PAO）The photometer is used to test the leakage concentration downstream of the high-efficiency filter in the tested facility. The testing points are distributed on all sections of the high-efficiency filter and the connection of the sealing material in the tested facility,Scan the sealing areas of the entire filter surface, between the filter and the frame, between the frames, and between the frames and the static pressure boxThe distance between the sampling head and the filter surface during scanning is about1Inches (approximately)2.54 cm）The scanning speed should not exceed5 cm/sScan back and forth in a straight line with overlapping lines. Read test data.

④ The maximum value of the test value is taken as the final leakage concentration (%), which is the integrity test result of the high-efficiency filter.