Developing a Functioning Low Constant Volume Fume Hood

Dr. Robert Haugen, Kewaunee Scientific Corporation

Abstract:

Developing a functioning Low Constant Volume fume hood involves a variety of design issues; some blatant, some subtle. This paper examines many of these issues in some detail regarding their importance and resolution.

These issues include economics, face velocity, volumetric minimums, containment, hazards related to low exhaust volume, correct HVAC application, and proper use.

It is obvious from the author's research on this type of hood at Kewaunee that energy savings and design flexibility are important positive factors for using LCV fume hoods. It is just as obvious that critical design and operating rules need to be adhered to.

Savings are possible with LCV hoods if fume hoods are concentrated inspecific labs. Face velocity must be robust enough to defeat room and personnel dynamic challenges. Volumetric minimums should not allow fewer than 5 air changes per minute inside hood cavity. Containment should be documented in an as used ASHRAE 110-1995 test with special circumstances. Low exhaust problems should be addressed both by fume hood design and use techniques. Correct make-up air diffuser locations should be used. Operator training should be a part of ANY fume hood use program.

Biography:

Not available at this time.