Envirco NSF Biohazard Cabinet Manuel d'utilisateur télécharger pdf (Page 23)

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)

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Envirco NSF Biohazard Cabinet Manuel d'utilisateur Page 23