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Motor/Blower
The motor/blower assemblies pull room air into the top of the enclosure, and into the
slots along the work surface perimeter. The air entering the top of the enclosure passes
through a HEPA filter, and then over the work area to create the downflow air. All the
downflow air, plus a portion of room air is drawn into the slots along the work surface
perimeter, and sent through a second HEPA filter before exhausting out the rear of the
enclosure. See Figure 5-4. The motors in the enclosure are 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 motors utilize
Labconco's exclusive Constant Airflow Profile
TM
(CAP) program to deliver a consistent
volume of air, throughout the life of the cabinet. This ensures that as the HEPA filters
load with particulate, constant and safe volumes of air are maintained without the need
to adjust the blower speeds.
Figure 5-4
71
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