855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 182

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Additional considerations Guidance for calculating weighted average efficiency improvement for heating or cooling equipment with multiple rated conditions is available in ASHRAE 90.1 2022, Sections 11.5.2.2.2 and 11.5.2.2.3, respectively.

Fan power The sum of all fan power installed within the project scope of work must be 20% less than the sum of total fan power allowed by ASHRAE 90.1 6.5.3.1.1 .

Eligibility for this credit requires the installation of at least one HVAC system with associated fans. Include all supply fans, return/relief fans, and fan-powered terminal units associated with the HVAC systems installed in scope. The project is ineligible to apply this strategy if for each HVAC system in scope, less than 50% of total system fan power is installed in scope.

For partial HVAC system installations (such as fan coils installed in the project scope with base building dedicated outside air), use the prorated fan power from the base building system to calculate the total percent improvement in system fan power for the associated HVAC system. Use only the fan power installed in scope to determine the overall percent improvement in fan power below the prescriptive limitation:

Equation 2. Fan power % improvement

Equation 2. Fan power % improvement 𝐹 𝐹 𝑝 𝑝 𝑝 % 𝑖 𝑖 𝑖 𝑖 𝑖 𝑖 =

∑(𝐹 𝐹 𝑝 𝑝 𝑝 𝑖 𝑠 𝑠 𝑠 𝑓 𝑓 𝑒 𝑒ℎ 𝐻 𝐻 𝑠 𝑠 𝑠 × % 𝑖 𝑖 𝑖 𝑖 𝑖 𝑖 𝑓 𝑓 𝑝 𝑝 𝑝 𝑓 𝑓 𝑒 𝑒ℎ 𝐻 𝐻 𝑠 𝑠 𝑠 ) (𝑡 𝑡 𝑡 𝑓 𝑓 𝑝 𝑝 𝑝 𝑖 𝑖 𝑖 𝑖 𝑖 𝑖 𝑝 𝑝 𝑝 𝑡 𝑠 𝑠 𝑠)

Additional considerations This strategy cannot be used when ASHRAE 90.1-2022 measures H01: HVAC System Performance Improvement (11.5.2.2.1) or H06: Reduce Interior Lighting Power (11.5.2.5.6) are used to document minimum required energy credits, since these are necessary for compliance with Path 1.

Case 2. Additional Efficiency Requirements Beyond ASHRAE 90.1-2022

APPLICABILITY Case 2 applies only to interior build-outs or substantial alterations that document compliance with ASHRAE 90.1-2022, Sections 5–10 and document a minimum number of required energy credits per ASHRAE 90.1-2022, Section 11.

For these project applications, Case 2 is more effective than Case 1 at distinguishing incremental energy improvements beyond the minimum level of performance required by ASHRAE 90.1-2022 .

U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 171