Labconco Protecto Stainless Steel Perchloric Acid Laboratory Fume Hoods 9682100 - Manual (Page 20)

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Chapter 3: Getting Started
should be sloped downward toward
the hood to prevent the pooling of the
washdown water and Perchloric acid
salts in the duct.
CAUTION: Perchloric Acid Fume
Hoods must never be manifolded into
a common exhaust system. They
require a dedicated exhaust system.
Connecting to the Exhaust
Washdown
The entire exhaust duct system must have an adequate
washdown system. This includes the exhaust ductwork
located between the exhaust blower and the hood
structure, the exhaust blower, and any ductwork located
on the outlet side of the blower. Wash rings are
recommended to be placed in the exhaust duct system
approximately every 8 to 10 feet and after every change
in direction to provide an adequate washdown. A drain
should be provided in your exhaust blower and this
washdown water and effluent material can be drained
from the exhaust blower back directly into the exhaust
duct for disposal. The Perchloric Acid Hood was
designed with an auxiliary port plugged at the factory
and it is intended to be connected to the washdown
valve system to provide water to the wash rings.
Simply plumb from the plugged connector with a 3/8"
rigid polyethylene, copper, or stainless steel line.
Connecting to the
Washdown Drain
The Protector Perchloric Hood has been supplied with a
2" nominal (2.375 OD) Type 316 stainless steel pipe
drain. Simply connect the 2" pipe to your floor drain.
Be sure the connection is either fully welded or leak
tight. See figure 3-2.
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