Basic Documentation

Table Of Contents
Fume Hoods
Siemens Industry, Inc. 35
Topic Requirement(s) Commentary
(Special
Purpose)
Perchloric
Acid
(Continued)
9. Each perchloric acid hood should have an individual exhaust system. Slope
horizontal runs to drain. Avoid sharp turns.
10. Construct the hood and duct to allow easy visual inspection.
11. Where required, use a high efficiency (greater than 80%) wet collector constructed
for perchloric acid service. Locate as close to the hood as possible to minimize
accumulation of perchloric acid in the exhaust duct.
12. Use only an acid-resistant metallic fan protected by an inorganic coating or an air
injector.
13. Lubricate the fan with fluorocarbon grease.
14. Locate the fan outside the building.
15. The exhaust discharge must terminate out-of-doors, preferably using a vertical
discharge stack that extends well above the roof eddy zone.