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SSPC-Guide 6 <br />October 1, 2004 <br />sizes through the enclosure to the exhaust hood in combina- <br />tion with good housekeeping practices to remove the heavier <br />particles. <br />7.5 ANSI Z9.2-1979 states in paragraph 4.8.1(1) that if <br />data on control velocity and volume are not available in reli- <br />able published information, control velocity and volume can <br />be determined by measurement of actual air-flow velocities for <br />projects on which control has been attained. ANSI Z9.2-2001 <br />simply refers to "Industrial Ventilation" and appropriate ANSI, <br />OSHA, and NIOSH publicationsfor recommended airflow rates. <br />Little information has been pubiished regarding control velocities <br />in field containments. As a result, the specifier may consider <br />allowing the contractor to demonstrate that the proposed air <br />velocity inside containment will provide the necessary and <br />desired controls (i.e., reduced worker exposures, controlled <br />blood lead levels, controlled emissions, etc.) to comply with <br />the OSHA mandate for engineering controls. <br />9-12 <br />