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- 10 -
CHAPTER III
INSTALLING YOUR CABINET
3.1 CHOOSING A SUITABLE LOCATION
Location impacts the nature and extent of external airflow disturbances, which may affect performance of
the clean bench when it is exposed to these disturbances.
When installing the clean bench, it should be located as far away as possible from sources of airflow
disturbance and in an orientation which
optimally shields the clean bench’s airflow from all external airflow
disturbances. Please note that the clean bench should not be placed close to another clean bench.
Please follow these guidelines when choosing a suitable location for your cabinet:
The location must be far away from :
a. personnel traffic flows
b. air vents (in and out)
c. door and window
d. any other sources of disruptive air currents or air drafts
If drafts or other disruptive air currents exceed the face velocity of the filter, the potential exists for
contaminated air to enter the work zone of the cabinet.
A minimum distance of 50 cm to the top of the ceiling is recommended for blower changing purpose.
A clearance of 183 cm (6ft) in front of cabinet is strongly advised in order to maintain proper airflow.
Please permit adequate space for cleaning behind the cabinet.
3.2 ENVIRONMENTAL/ELECTRICAL CONDITIONS
This cabinet is designed to be used under the following conditions:
1. Indoor use.
2. Altitudes up to 2000 meters or 6600 ft.
3. 20% - 60% relative humidity.
4. Temperature range from 20 deg C to 30 deg C (68 deg F to 86 deg F).It is recommended that the
temperature in the laboratory be maintained /-2 deg C under all conditions.
5. Main supply voltage fluctuations not to /- 10% of the nominal voltage. It is recommended that
the voltage fluctuation doesn't /- 2% of the nominal voltage at all times.
6. Installation Category: 2.0
Installation category (over voltage category) defines the level of transient over voltage which the
instrument is designed to withstand safely. It depends on the nature of the electricity supply and its over
voltage protection means. For example, in CAT II, which is the category used for instruments in
installations supplied from a supply comparable to public mains such as hospital and research
laboratories and most industrial laboratories, the expected transient over voltage is 2500 V for a 230 V
supply and 1500 V for a 120 V supply.
7. Pollution Degree: 2.0
Pollution degree describes the amount of conductive pollution present in the operating environment.
Pollution degree 2 assumes that normally only non-conductive pollution such as dust occurs with the
exception of occasional conductivity caused by condensation.
8. Power Cord: 1) For units intended to be operated at 120 volts (North America): Use a UL-listed and
CSA-certified cord set consisting of a minimum 18 AWG, Type SVT or SJT, three-conductor cord, a
maximum of 15 feet in length and a parallel blade, grounding-type attachment plug rated 15 amperes,
125 volts. 2) For units intended to be operated at 230 volts. Use a cord set with a grounding-type
attachment plug. The cord set should have the appropriate safety approvals for the country in which the
equipment will be installed.