Labconco PURICARE Procedure Station Models 31260 - Manual (Page 84)

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4. Locate a sampling port downstream of the exhaust HEPA filter. The sampling
port should ideally be at least 10 duct diameters from any elbow and 10 duct
diameters downstream of the filter.
5. The Logic+ is now ready for the Exhaust HEPA Filter Leak Test. Set the
photometer sampling valve to “DOWNSTREAM”. Ensure there is a proper
vacuum at the sampling tube.
6. Open the Laskin nozzle(s).
7. Ensure the pressure gauge on the generator is reading 20 +/- 1 PSIG.
8. Observe the average concentration of aerosol downstream.
Acceptance
Average aerosol penetration shall not exceed 0.005%.
Reassembly
Reinstall the prefilter on the towel catch, if so equipped.