855773667-LEED-v5-O-M-Reference-Guide-Launch-Edition-1 - Page 217

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• Compare the measured results for each ventilation system with the calculated minimum amount of outdoor air required by ASHRAE 62.1-2022 and determine next steps. If spaces are under-ventilated, document the circumstances and potential corrective actions. Compliance with minimum outdoor rates is highly encouraged but not required for this prerequisite (excluding residential units).

  • Identify the filtration level (minimum efficiency reporting value, MERV, level in accordance with ASHRAE 52.2 or filtration media class as defined by ISO 16890-2016 ) for each ventilation system that supplies outdoor air and each HVAC system that supplies recirculated air to occupied spaces. If filtration levels are below MERV 13 (or equivalent filtration media class of ePM1 50%), evaluate options for improving filter efficiency and document the circumstances and potential corrective actions. Compliance with MERV 13 is highly encouraged but not required for this prerequisite.

For systems with outdoor air economizers, confirm that the current equipment is operating per design intent and modify if necessary.

For naturally ventilated spaces, identify the opening types, location of the openings, and size of the openings. Visually inspect each opening and adjacent areas for cleanliness and integrity and clean as needed. Remove all visible debris or visible biological material observed and repair physical damage to louvers and screens if such damage impairs the item from providing the required outdoor air entry. Test and confirm manual and/or automatic opening apparatus for proper operation and repair or replace as necessary.

For spaces with mechanical exhaust, test and modify if necessary to confirm proper operation of the exhaust systems as outlined in the current facilities requirements and operations and maintenance plan.

Residential For all common areas in the building, meet the requirements above.

For residential units, have an operable window in each bedroom with the total openable window area a minimum of 4% of the room floor area or meet the following minimum requirements for the entire unit.

Equation 1. Minimum outdoor air rate n IP units

Equation 1. Minimum outdoor air rate n IP units

sq. ft. sq. ft. Minimum outdoor air rate in cfm = 0.03 cfm/ x dwelling unit �loor area (in )

sq. ft.

• 7.5 cfm/person x (number of bedrooms + 1)

U.S. Green Building Council LEED v5 Reference Guide for Operations and Maintenance, April 2025 Launch Edition 207