14
The exhaust system must be capable of moving the following volumes of exhaust air at
the negative pressures listed. The Airflow Volumes are the values recorded via direct
measurement using a flow hood at the front opening of the cabinet. The Concurrent
Balance Values are measured in the exhaust duct via traverse methodology, and will
always be higher due to differences in volume measurement methodologies.
1: Unlike Type B biosafety cabinets, the recommended vacuum will remain constant throughout the life of
the exhaust HEPA filter. Duct vacuums below 0.2 inches H
2
O (50 Pa) or above 0.5 inches H
2
O (125 Pa)
may result in erratic operation and throw an alarm condition from the product.
2: WC = Inches of Water Column, typically expressed in units of inches H
2
O.
Air-Tight Damper
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