Labconco Protecto Stainless Steel Perchloric Acid Laboratory Fume Hoods 9682100 - Manual (Page 28)

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Chapter 4: Performance Features and Safety Precautions
by-pass air configuration on the Perchloric Acid
Fume Hoods is totally dependent on air being
supplied to the hood from its surrounding
environment for proper operation.
The hood is designed to handle Perchloric acid
operations of all types. Usage of materials other
than Perchloric acid in this enclosure is not
recommended. Perchloric acid is a strong oxidizing
agent, and should not be used in combination with
any organic material as the possibility of a
hazardous chemical reaction or explosion could
develop.
The integral washdown system in the Perchloric
Acid Fume Hood allows the operator the ability to
wash behind the baffle and ensure that a build-up of
Perchloric acid salts does not develop in that
location. All of the washdown water from the
internal spray nozzles is contained behind the baffle
and does not interfere with normal operations being
performed inside the hood. The washdown water is
collected in the hood drain trough.
The hood liner must be washed down manually by
the operator at such times is convenient to do so.
The internal washdown system is also able to be
connected to the wash rings used in your hood
exhaust system. The water used in the spray wash
rings is collected in the hood drain trough once it
has been allowed to flow down and cleanse the duct
thoroughly.
WARNING: It is recommended that
the Perchloric Acid Hood be washed
down thoroughly after every usage for
10 minutes, at least once a day.
!