Class II Biological Safety Cabinets
5.3.2.2. Damper Adjustment
The damper is used to balance the downflow velocity and exhaust velocity. The damper needs to be adjusted
when the downflow velocity does not meet the accepted criteria (refer to the cabinet’s technical
specifications). Open the damper opening if the downflow velocity is too high; close the damper opening if the
downflow velocity is too low.
Damper Thumbscrew
Figure 5.1. Adjustment of damper.
Loosen the thumbscrew(s) to slide the damper left or right to increase or reduce the downflow velocity.
5.4. Parts Replacement
The use of non-Esco parts and / or parts not supplied directly by Esco or our authorized distributors, including
but not limited to maintenance parts, spare parts, replacement parts, system components and / or system
accessories, shall void all expressed or implied warranties.
5.4.1. Filter Replacement Procedure
Under normal usage and barring any accident (example - puncture), the two filters do not need replacement
unless and until the inflow and / or downflow velocity can no longer be maintained within the specifications.
1. Before the filters are removed from the BSC, their contaminated faces should be taped off using
plastic, cardboard or some other suitable material. This will minimize the risk of personnel in the
event the decontamination was not thorough.
2. Used filters should be disposed in accordance with local regulations. They may have to be incinerated
as medical waste. They should be double bagged and appropriately labeled after being removed from
the cabinet.
3. Proper PPE (based on your risk assessment) should be worn while removing used filters. You should
dispose of these things after the procedure. Finally you should properly wash your hands.
4. Before the new filters are installed, all surfaces should be thoroughly cleaned of silicon and/or
adherent gasket material. The new filter should be carefully handled and examined before being
fitted. It is important that the filters and the gaskets be checked for leaks prior to use.
The filters should not be replaced until the entire cabinet has been decontaminated.
Two persons may be required to facilitate filter changing on 5’ and 6’ BSC.
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