Proposed Amended Rule 1111 – Reduction of NOx Emissions from Natural-Gas-Fired, Fan-Type Central Furnaces

Rule 1111, which is designed to reduce emissions of nitrogen oxides (NOx) from residential and commercial gas-fired fan-type space heating furnaces, includes an alternate compliance option allowing manufacturers to pay a per-unit mitigation fee depending on the furnace type, in lieu of providing furnaces capable of achieving the applicable NOx emission limits. Proposed Amended Rule 1111 (PAR 1111) seeks to extend the end date of the mitigation fee alternate compliance option for mobile home furnaces with a NOx emission rate of 40 nanogram per Joule (ng/J) from September 30, 2025 to September 30, 2030 which will result in delayed NOx emission reductions by approximately 0.014 ton per day (equivalent to 27 pounds per day). However, by providing additional time for manufacturers of mobile home furnaces to develop lower NOx-emitting units, manufacturers of mobile homes as well as owners of mobile homes who may be in need of replacing their furnaces during the next five years will have a benefit of uninterrupted access to commercially available equipment.