None of the above four equations are final yet since much of this week was done for non ducted systems-working groups in Europe and the Us are actively pursuing finalization of these documents including consideration of ducted system etc; more is expected by the end of 2012. However, without these A2L standards available sooner, the industry will be at risk in meeting any future potential phase down scenarios since delaying early implementation of Lower-GWP solutions in new equipment will cause more R410A build u poo in the installed aftermarket where A2L likely cannot be a retrofit solutions.