We are specifying flush valves which are compliant with EPact 92. They also have adjustment feature to reduce further than nominal compliance values. If we adjust to achieve 20% reduction, and owner finds the adjustment performs satisfactorily, will Credit 3.1 be granted?
The flow rate from an adjustable flush value could be utilized in the LEED calculations for WE Credit 3.1. The flow rate setting should be explicitly specified (at 0.8 GPF in your example). Documentation from the product manufacturer should show that the flush valve is adjustable and to what range it is adjustable. In addition, verification of the installed, actual GPF should be provided by the installer and verified by the commissioning agent. The granting of WE Credit 3.1 will be determined by a review of the calculations and documentation provided during the certification process.