Labconco Protecto PVC Laboratory Fume Hoods 14181 Series - Manuel (Page 38)

Chapter 5: Using the Protector PVC
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Original instructions
Unloading Materials and Equipment

Objects in contact with contaminated material should be surface
decontaminated before removal from the hood.

All open trays or containers should be covered before being removed from
the hood.
Final Washdown Procedure

Water washdown or flooding the surfaces with water is standard practice
and results in reduction of contamination on the PVC liner material due to
Perchloric acid salts or acids.

Proper operation of your PVC 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 or acids 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.