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Description
English: Figure 11. Laboratory bypass hood (note the by-pass chamber above the sash). The bypass hood maintains a constant hood face velocity and incorporates a bypass grille located above the sash opening. When the sash is wide open it blocks the bypass grille, allowing all of the air to flow through the hood opening. As the sash is lowered, it uncovers increasingly greater amounts of the bypass grille, allowing increasing amounts of air to flow through this alternative path. If it is designed and operated properly, the amount of air flowing through the bypass grille is just sufficient to maintain a constant face velocity. Typically, however, this constant velocity can be maintained over a certain part of the sash’s total range.
Date
Source General Safe Practices for Working with Engineered Nanomaterials in Research Laboratories (in en-us). U.S. National Institute for Occupational Safety and Health pp. 20–21 (May 2012). Retrieved on 2017-03-05.
Author U.S. National Institute for Occupational Safety and Health
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This image is a work of the National Institute for Occupational Safety and Health, part of the Centers for Disease Control and Prevention in the United States Department of Health and Human Services, taken or made as part of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain.

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May 2012

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Date/TimeThumbnailDimensionsUserComment
current00:00, 18 March 2017Thumbnail for version as of 00:00, 18 March 2017865 × 525 (415 KB)John P. Sadowski (NIOSH)User created page with UploadWizard

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