ULEF products contributing to IEQc4.4

You are correct that ULEF is not the same as NAF. However, as you can see from the CARB formaldehyde emission limit requirements, CARB approved ULEF exempt emission limits are equal to CARB approved NAF emission limits. NAUF = 0.09 ppm maximum (same as CARB Phase 2) CARB approved ULEF = 0.08 ppm maximum CARB approved ULEF exempt = 0.06 ppm maximum CARB approved NAF = 0.06 ppm maximum The LEED interpretation #10250 http://www.usgbc.org/node/1732513?view=interpretations does not pertain to v4, it pertains to LEED v2009 and it does not address assemblies. It specifically addresses the raw composite wood product. The credit previously only allowed for NAUF resin systems and now allows for CARB approved ULEF made with MUF resin systems. Assemblies should be fabricated using composite wood panels that meet this criteria. For clarification, LEED v4 – Low-emitting materials –Composite Wood evaluation allows ULEF and NAF products to meet the criteria without a stipulation regarding resin system. Composite Wood Evaluation. Composite wood, as defined by the California Air Resources Board, Airborne Toxic Measure to Reduce Formaldehyde Emissions from Composite Wood Products Regulation, must be documented to have low formaldehyde emissions that meet the California Air Resources Board ATCM for formaldehyde requirements for ultra-low-emitting formaldehyde (ULEF) resins or no added formaldehyde resins.