855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 475

Extracted Content

• A carbon monoxide (CO) monitor must be installed on each floor of each dwelling unit, hard-wired with a battery backup. CO monitors are required in all types of units, regardless of the type of equipment installed in the unit.

  • Any indoor fireplaces and woodstoves must have solid glass enclosures or doors that seal when closed. Any indoor fireplaces and woodstoves that are not closed combustion or power-vented must pass a backdraft potential test to ensure that depressurization of the combustion appliance zone is less than 5 Pa.

  • Space- and water-heating equipment that involves combustion must be designed and installed with closed combustion (i.e., sealed supply air and exhaust ducting) or with power-vented exhaust or located in a detached utility building or open-air facility.

AND

Entryway System Design

Install permanent entryway systems to capture dirt and particulates entering the building at primary exterior entrances. There is no length requirement for entryway systems.

REQUIREMENTS EXPLAINED

This prerequisite requires the project team to research regional and local air quality and provide ventilation systems and design elements that effectively support air quality within the building. Healthcare and residential projects have additional considerations.

Investigate Regional and Local Air Quality

Indoor air quality is significantly influenced by outdoor air quality, which can be highly localized varying over time, season, and throughout the project site.

To understand outdoor air quality for the project, regional air quality and local air quality must be investigated, considering seasonal variations. ASHRAE 62.1 provides a template for documenting this investigation. In many regions, spring months have higher pollen levels from flowering plants and trees. Summer months in some dry, hot regions have higher levels of PM2.5 due to wildfires and ozone from photochemical smog. Air quality for the project’s location will likely change over time, due to climate change. For example, the periods with higher pollen levels and wildfires may increase or intensify. For this reason, information collected during the IPp1: Climate Resilience Assessment should be included in this investigation.

U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 465