1.3.1.2
HEPA/ULPA Filter Leak Test
The filter was challenged with PAO aerosol of fixed concentration. The aerosol was evenly distributed
throughout the supply (positive) cabinet plenum. An aerosol photometer was used to monitor aerosol
penetration downstream of the filter, and to scan for the presence of leaks.
Use calculated method, along with ATI TDA-4Blite aerosol generator, the upstream aerosol concentration
can be calculated using the following equation:
Aerosol concentration =
13,500Γπ
πππ‘ππ π΄ππππππ€ πππ
, where N = Number of Laskin nozzle(s) opened
See Chart for Total Airflow below:
Acceptance: Maximum particle penetration of 0.01% for filters; no filters leaks present.
Result: Pass / Fail
Acceptance criteria / testing procedures have been adopted in accordance with the requirements of the:
a.
EN 1822 βHigh Efficiency Air Filters (HEPA and ULPA)β
b.
IEST-RP-CC034.3 βRecommended Practice for HEPA and ULPA Filter Leak Testsβ
AS 1807.6 β Filter Installation Integrityβ
1.3.1.3
Particle Count Test
Use a particle counter with sampling rate of 0.028 m
3
(1 ft.
3
) of air per minute. Put the particle counter
sampling cone inside the work zone, following the grid below:
Actual PAO concentration: οg/liter
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