Labconco Protecto Stainless Steel Perchloric Acid Laboratory Fume Hoods 9682100 - Manual (Page 40)

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Chapter 5: Using Your Protector Perchloric Acid Fume Hood
Final Purging
• Upon completion of work, the hood should be
allowed to operate for two to three minutes
undisturbed, to purge airborne contaminants
from the work area before shutting down
blower.
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 316 stainless
steel liner material due to Perchloric acid.
• Proper operation of your Perchloric Acid Fume
Hood requires that you wash the fume removal
system down sufficiently to ensure that there is
no build up of Perchloric acid salts 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 cleaned directly by the
operator. Because the volume of Perchloric acid
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.