Labconco Biological Safety Cabinets 34610 Series - Manual (Page 28)

Chapter 4: Performance Features and Safety Precautions
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Motor/Blower
The motor/blower assembly pulls air through the top of the cabinet, and is
sent through the supply HEPA filter. The filtered air flows down through the
work area where it provides a clean environment to perform work. Room air
is drawn into the front intake grille. All of the air is then drawn through an
exhaust HEPA filter and out of the laboratory, as shown in Figure 4-4. The
motor in the Purifier Logic Series Cabinet is an electronically commutated
motor (ECM). The ECM is a brushless DC motor that includes its own power
supply to convert the incoming alternating current to direct current, as well as
its own microprocessor to control and measure the motor’s operation. The
motor is preprogrammed to deliver a consistent volume of air, even as the
supply HEPA filter loads over time.
Figure 4-4