Indoor Environmental Quality, Prerequisite 3: Minimum Acoustical Performance The LEED Steering Committee (LSC) has approved a PIEACP for Indoor Environmental Quality, Prerequisite 3: Minimum Acoustical Performance. PIEACP stands for Performance/Intent Equivalent Alternative Compliance Path, and was established in the LEED Product Development and Maintenance Manual as “a strategy to ensure that LEED products remain technically relevant and market savvy.”
