CFR 40-63.544-2014 Protection of Environment. Part63:National emission standards for hazardous air pollutants for source categories. Section63.544:What are my total enclosure standards?
(a) You must operate the process fu-gitive emissions sources and fugitive dust sources listed in paragraphs (a)(1) through (9) of this section in a total en-closure that is maintained at negative pressure at all times and vented to a control device design
CFR 40-63.544-2014 history
2014CFR 40-63.544-2014 Protection of Environment. Part63:National emission standards for hazardous air pollutants for source categories. Section63.544:What are my total enclosure standards?