US EPA is proposing chromium and particulate matter (for metals) standards for wool fiberglass gas-fired glass-melting furnaces at area sources and to add these sources to the category list in the Urban Air Toxics Strategy. EPA is also proposing amendments to the existing major source rules for Mineral Wool and Wool Fiberglass which were published on November 25, 2011.
While subpart NNN applies to wool fiberglass manufacturing facilities that are major sources, EPA proposed rule would apply to gas-fired glass-melting furnaces only located at wool fiberglass manufacturing facilities that are area sources (subpart NN). Comments on the proposed rule must be received on or before May 30, 2013.