Envirco BSC - Manual (Page 12)

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III. Adjustments and Testing
3.1 Adjust on site
Before packing and transport, this safety cabinet has been tested and confirmed in our
factory; however, another test after installation must be performed. Only qualified personnel
can adjust this device and in order to ensure the accuracy of the on-site testing, this test
equipment must be calibrated. If you cannot implement this operation, please contact
ENVIRCO to provide a local on-site testing services company.
On site adjustment should include the following:
- Check the safety cabinet inflow
- Check the safety cabinet internal decline airflow rate
- Check airflow inside the cabinet by using smoke simulator
- When the cabinet is connected to the building’s exhaust system, balance the air emission.
Toensure that your new equipment is accurate, perform an on-site inspection. The equipment
cannot be used without this pre-test, performed by qualified personnel.
Do not adjust the fan speed without fully testing decline of the wind speed and the inflow air.
The manufacturer has already set the correct air flow; no further adjustments should be
required. Do not change the valve set of the ratio between the exhaust and air supply unless a
qualified person thinks it is necessary to do.
3.2 Tests and standards
3.2.1 Filter leakage test
The standard aerosol testing for the integrity of the HEPA filtersis generally performed
annually. Qualified personnel must use a calibrated device when aerosol testing. A
referenced list will be provided by the factory.
NOTE: Place connection between supplyair and exhaust filters hose test for pressure
(the middle hose) photometer upper (PAO test point connection).
3.2.2 Air adjustment at the opening of the work area
The exhaust HEPA filter should be installed on the top of the biosafety cabinet. The air volume
exhausted is equal to the air volume entering from the work area opening. The average
velocity entering the opening of the work area has been identified during the design of the bio
safety cabinet. The test should conform to the rules of NSF49. The opening air velocity testing
data is in APPENDIX 1. To adjust the fan speed, adjustments should be according to the data
specified in APPENDIX 1.