855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 299
Extracted Content
AND/OR
Option 2. Ventilation Energy Recovery (1 point)
Each fan system supplying outdoor air must have an energy or heat recovery system with a minimum 70% enthalpy recovery ratio or a minimum of 75% sensible heat recovery ratio. Provisions must be made to bypass or control the energy recovery system during moderate outside air conditions.
In aggregate, fan systems supplying less than 15% of the project’s total outdoor air can be excluded.
Core and Shell only Fan systems must supply a minimum of 50% of the ventilation air required for the project per ASHRAE Standard 62.1-2022, Ventilation Rate Procedure, to qualify for this option.
AND/OR
Option 3. Thermal Bridging (1 point)
Comply with the prescriptive thermal bridging requirements of ASHRAE 90.1-2022, Section 5.5.5(a), including all applicable requirements of Sections 5.5.5.1–5.5.5.5, without applying exceptions for projects in climate zones 0–3.
AND/OR
Option 4. Peak Thermal Load Reductions (1–3 points)
Comply with the following:
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Ventilation loads must be included in the determination of peak coincident loads.
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Measure building envelope air leakage using air leakage testing and use the measured air leakage to calculate the peak loads for Path 1, Path 2 (envelope), and Path 3. (Meeting the leakage rates in Option 1 is not required to pursue this option.)
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Demonstrate balanced ventilation meeting the criteria in Option 1 above.
AND
PATH 1. PEAK LOAD INTENSITY (1–3 POINTS)
Limit the sum of peak heating load and peak cooling load per unit of treated floor area to be less than or equal to the thresholds specified in Table 2 below. Calculate peak loads using one of the following:
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 289