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![]() From American Conference of Governmental Industrial Hygienists (ACGIH®), Date: 1-91, Figure VS-50-22, Industrial Ventilation : A Manual of Recommended Practice, 23rd Edition. Copyright 1998. Reprinted with permission. For problems with accessibility in using figures and illustrations in this document, please contact the Directorate of Technical Support and Emergency Management at (202) 693-2300. |