Envirco BSC - Manual (Page 16)

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4.1.3 The air filter system
Figure 7 is the equipment’s air flow pattern and the protection zone. The air filter system is the
main system to guarantee the equipment’s performance. It consists of a blower, wind pipe,
supply filter and exhaust filter.
The air filter system’s main function is to produce clean air for the work zone. The average
vertical down flow velocity of the clean air in the work zone can reach 0.33fpm +-0.015m/s,
while cleaning the exhausted air and preventing environmental pollution.
4.1.4 Use instructions
(a)The equipment is designed for continuous work, but in order to prolong the HEPA filter’s
life, it is recommended opening it only when necessary. Run the equipment with electrical
power several minutes to ensure the air flow remains steady inside the cabinet. If the cabinet
has deposits in the contamination area, there should be no operation.The front panel should
remain closed to keep the work zone area safe until work area has been properly cleaned.
(b) Use a proper disinfectant to clean the internal work zone before operation.
(c) Examine the pressure readings; when the fan motor is open, you can feel the air flow
across the front window.
(d) When the glass door is open, the ultraviolet lights will not operate.
(e) Inspect the drainage valve and put it into the closed position.
(f) Arrange your experiment and work flow. Don’t mix the work zone with unnecessary items.
(g) Test results have indicated that the protection of the?? safety cabinet is excellent over
extended periods of time.
(h) When a dispensing operation is being carried out within the cabinet, samples should be
moved for storage to the right or left side of the dispensing operation. If the correct techniques
are exercised, there will be no cross-contamination within the cabinet.
(i) Remember the operator’s arms and hands will be the primary source of contamination and
particulates, so one must use sterilized gloves and soap to clean hands and arms.
(j) When the outside air and the adjoining work area are seriously polluted, the operator
should take the proper measures to prevent the particulates from entering the clean work
area.
(k) The air return grills at the front and rear of the work area must never be blocked, especially
when sterile drapes are being used.