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This action will address the Agency's residual risk and technology review (RTR) of the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Wet-Formed Fiberglass Mat Production. The Wet-Formed Fiberglass Mat Production NESHAP, subpart HHHH, was promulgated pursuant to section 112(d) of the Clean Air Act (CAA) on April 11, 2002. The NESHAP established emission limitations based on maximum achievable control technology (MACT) for controlling emissions of hazardous air pollutants (HAP) from drying and curing ovens. The HAP emitted from drying and curing ovens include formaldehyde and methanol. This action will implement the residual risk review requirements of CAA section 112(f)(2) and the technology review requirements of CAA section 112(d)(6). CAA 112(f)(2) directs EPA to revise the NESHAP if such revisions are required to provide an ample margin of safety to protect public health or to prevent, taking relevant factors into account, an adverse environmental effect. CAA section 112(d)(6) requires the EPA to review and revise the MACT standards as necessary, taking into account developments in practices, processes and control technologies, no less often than every 8 years. Pursuant to a court order related to the review of 13 source categories, the EPA must complete 7 final RTR actions by December 31, 2018, and 6 additional RTR actions by June 30, 2020. The EPA currently plans to complete this action by December 31, 2018.