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Step 5:
Locate the ‘Aerosol Challenge and Introduction Location’ label behind the front Fascia panel for
information on the Primary and Secondary methods for HEPA leak testing.
Primary Method:
Calculating the Filters Upstream Challenge.
Refer to
Table 1: Calculated Concentrations
for total airflow, Laskin nozzles and calculated aerosol
concentration. Upstream concentration must be a minimum of 10 micrograms per liter (µg/L). The
following formula was used to determine calculated aerosol concentration values.
#Laskin Nozzles x 13,500 / Cabinets Total Airflow
AEROSOL CHALLENGE AND INTRODUCTION LOCATION
Primary Method: Calculating the Filters Upstream Challenge
1. Place a tee fitting on the end of the aerosol generator hose and position
the tee in the middle of the rear work surface perforation. [See Figure 1]
2.
Calculate the filters upstream challenge by using the following formula;
Number of Laskin Nozzles x 13,500/ Cabinet Total Airflow
Once the number of Laskin nozzle(s) producing10 micro grams per liter
of aerosol concentration is determined, set the internal reference on the
Photometer per manufacturer
'
s instructions. [Reference Table 1 below]
Table 1: Calculated Concentrations
Model
(Sash Opening)
SG404
8” 10” 12”
SG504
8” 10” 12”
SG604
8” 10” 12”
Total Airflow
(CFM)
684
777
831
877
926
1003
1053
1173
1015
Laskin Nozzles
needed
2
2
2
2
2
2
2
2
2
Calculated aerosol
concentration
(ug/L)
39
35
32
31
29
27
26
23
27
3. Scan cabinet filter(s) for leaks per NSF 49 guidelines.
4. Sustained aerosol penetrations shall not exceed 0.01% of the upstream
concentration.
Secondary Method: Measuring the Filters Upstream Challenge
Figure 1: Section view of cabinet at work surface elevation
1. Place a tee fitting on the end of the aerosol generator hose and position
the tee in the middle of the rear work surface perforation. [See Figure 1]
IMPORTANT
Decontaminate the
cabinet
before removing the port plug in Figure 2 .
2. Measure the filters upstream challenge concentration of aerosol through
the port shown in Figure 2. (Note: NSF/ANSI Standard 49 requires a
minimum upstream concentration of 10 micro grams per liter.) Set
upstream challenge value on photometer per manufacturer's instructions.
3. Scan cabinet filter(s) for leaks per NSF 49 guidelines.
4. Sustained aerosol penetrations shall not exceed 0.01% of the upstream
concentration.
Figure 2: Section view of cabinet at work surface elevation
with work surface not shown
NOTE: Must lift up and support front of work surface during challenge
43675
Aerosol generator hose with tee
end fitting (Recommended)
Rear work surface
perforation
Work surface
Filters upstream concentration port
Warning Label – Decon
before removing plug
Summary of Contents for SterilGARD SG404
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