Envirco NSF Biohazard Cabinet User Manual
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Rear of work deck
Probe set at the bottom edge of the window
Figure 9: Downflow Velocity Grid, Models 10276, 6-Ft Type A and 10451,
6-Ft Type B3
Inflow Airflow Measurement (Type A & Type B3 Units)
Direct Inflow Method
The inflow airflow is measured by placing the 8” x 24” hood directly in front of the window
and blocking off the entire remaining opening. Take measurements with the Shortridge
device and adjust the exhaust airflow by adjustment of the interior damper and the solid
state speed control, as required.
Calculated Method
The exhaust airflow is measured approximately four inches above the face of the exhaust
filter even with the top plane of the exhaust housing. Take measurements at approximate
locations as depicted by the exhaust velocity grids shown below. Adjust the exhaust airflow
by adjustment of the interior damper and/or the solid state speed control.
6.00”
5.88”
5.88”
7.25”
6.00”
(Typical)