ROUNDTABLE between promulgation of the regulation and the effective date of the transition. And, it prohibits any user sector rules from being effective prior to Jan.1, 2023. Doniger and Theodoridi: Rules of this kind cannot be retroactive. For the end uses for which the original effective date is in the past, NRDC expects the EPA to adjust the compliance deadlines into the near future. For those end uses for which the original dates have yet to take effect, NRDC doesn't anticipate any additional delays. A table of each end-use's proposed effective date can be found in NRDC's petition.2 How well aligned will the U.S. be with Canada? Yurek and Walter-Terrinoni: Canadian regulations require the transitions noted in SNAP Rules 20 and 21 and AHRI's commercial refrigeration petition. AHRI has had discussions with Environment and Climate Change Canada regarding the additional transitions for air conditioning and commercial refrigeration noted above. Doniger and Theodoridi: Canada has established both HFC phasedown and end use regulations. Canada's end use HFC limits weren't affected by the U.S. court decision. The recently filed petitions asking EPA to establish end use regulations under the AIM Act cover the same uses as the Canadian regulations and would largely restore the alignment between the U.S. and Canada. Will Mexico have to align goals to the U.S. and Canada because of the integrated economies? Yurek and Walter-Terrinoni: U.S. and Canada economies are indeed integrated and will likely influence manufacturing practices in Mexico as well. In time, AHRI may reach out to Mexico's Secretariat of Environment and Natural Resources for their consideration. Doniger and Theodoridi: Both Mexico and Canada have ratified the Kigali Amendment to the Montreal Protocol, which mandates a phasedown of HFCs. U.S. President Joe President Biden has set in motion the process for the U.S. to ratify the Kigali Amendment after Senate advice and consent. NRDC would be happy to explore with other stakeholders measures that Mexico could take to align their HFC requirements with the U.S. and Canada. High Performance. Narrow Profile. For exceptional efficiency in a narrower profile, Ruskin® DC-series dampers feature high-performance airfoil blades, a Class 1A leakage rating* and an all-new coupler option that joins two damper sections without a jackshaft. *AMCA Class 1A leakage is defined as 3 cfm @ 1-in.wg. ruskin.com 28 ASHRAE JOURNAL ashrae.o rg J U N E 2 0 2 1http://www.ruskin.com https://www.ashrae.org/