Proposed Rule (PR) 1147.2 has been developed to reduce nitrogen oxide (NOx) emissions and limit carbon monoxide (CO) emissions from metal melting furnaces, metal heat treating furnaces, and metal heating and forging furnaces which require a South Coast AQMD permit at RECLAIM, former RECLAIM, and non-RECLAIM facilities. PR 1147.2 defines applicable equipment categories, updates NOx emission limits, and establishes a new CO limit. PR 1147.2 also includes compliance schedules with transition emission limits as well as provisions for monitoring, reporting, recordkeeping, and exemptions from specific provisions. To achieve the proposed NOx emission limits according to the compliance schedule set forth in PR 1147.2, the following physical changes are anticipated to require minimal construction activities, with most occurring in the first three years but lasting up to 35 years after PR 1147.2 is adopted: 1) approximately 62 burners may be replaced with Ultra Low NOx Burners (ULNBs) or Low NOx Burners (LNBs); 2) one new selective catalytic reduction (SCR) system with one new ammonia storage tank may be installed; and 3) two existing SCR systems may be modified. For all other units subject to PR 1147.2, the affected equipment would be either replaced or modified at the end of their useful life, or will qualify for an exemption from the emission limits if the NOx emissions are less than one pound per day. Upon full implementation, the proposed project is expected to achieve 0.5 ton per day of NOx emission reductions.