NuAire LabGard NU-813-300, Руководство по эксплуатации и техническому обслуживанию

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OM0236 Page 35 of 52
February/2019
7.6 Filter Integrity Check
The filter must be scan tested before installation into the CVE. Once installed, an internal reference leak test can be
performed to assure a proper installation was performed. Challenge aerosol (One Laskin Nozzle, PAO) should be supplied in
the rear center of the workzone and the exhaust probed above the ring. When probing, a leakage shall not exceed 0.005%
of the upstream concentration.
Internal reference concentration with one Laskin Nozzle open should be:
Laskin Nozzle Concentration Formula
# Nozzles x 135 CFM x 100 ug/L
= Challenge
Inflow (CFM) Concentrations (ug/L)
# Nozzles x 229 CMH x 100 ug/L
= Challenge
Inflow (CMH) Concentrations (ug/L)
Airflow FPM (m/s)
60 (.30) 80 (.41) 100 (.51)
Size Challenge (ug/L)
300/E 93 69 56
400/E 69 52 41
600/E 46 35 28