Labconco Protector Stainless Steel Perchloric Acid Laboratory Fume Hoods 1308 Series - Manuel (Page 38)

Chapter 5: Using the Protector Perchloric Acid
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Original instructions
Final Washdown Procedure

Water washdown or flooding the surfaces with water is standard practice
and results in reduction of contamination on the Type 316 stainless steel
liner material due to Perchloric acid.

Proper operation of your Perchloric Fume Hood requires that you wash the
fume removal system down sufficiently to ensure that there is no build up
of Perchloric acid salts or acids within the entire system.

Normal washdown procedures suggest that you run the wash system in the
exhaust duct with the fan on for approximately 1-2 minutes, and then with
the fan off for approximately 10 minutes to thoroughly clean this portion of
the exhaust system.

In addition to this, the internal hood spray nozzles should be activated for
approximately 10 minutes after the completion of your procedures to clean
behind the baffle in the hood. Work areas in front of the baffle in the hood
will need to be manually cleaned by the operator. Because the volume of
Perchloric acid salts can vary greatly due to specific procedures and
workloads, you should consult your in-house Safety Officer for specific
rules and frequency requirements for washing down your total system.
Shutdown

Only turn off the fluorescent light and hood blower if final washdown is
complete, and then close the sash.