ID#1701 made on
EQc1 - Carbon dioxide (CO2) monitoring
LEED BD+C: New Construction, LEED O+M: Existing Buildings, LEED ID+C: Commercial Interiors, LEED BD+C: Core and Shell, LEED BD+C: Schools
USGBC allows projects registered under LEED-NC v2.1 to use LEED-NC v2.2 credits. USGBC also decided after this initial decision that certain credits must be a group because they were logically linked...
USGBC allows projects registered under LEED-NC v2.1 to use LEED-NC v2.2 credits. USGBC also decided after this initial decision that certain credits must be a group because they were logically linked together. In this case EQ Prerequisite 1, Credit 1 and Credit 2 are a linked group. Some LEED-NC v2.1 projects pursuing EQ Credit 1 that completed design before the credits were grouped together by the USGBC. This means that CO2 sensors were designed into the system and construction was completed before the credit grouping occurred. If CO2 sensors were installed for every mechanical ventilation system that monitor non-densely occupied spaces, and those sensors provide monitoring in the breathing zone as defined by LEED-NC v2.2 (3 feet to 6 feet above the floor), can the sensors be used to obtain credit under v2.2 in lieu of the required direct outdoor airflow measurement devices? In essence, can CO2 monitoring be used non-densely occupied spaces, so long as the sensors meet the requirements for densely occupied spaces? Approving an approach as described above would help prevent v2.1 projects, which determined long ago that they meet the requirements of v2.2 for EQ Prerequisite 1 and Credit 2 more effectively than the v2.1 requirements, from ripping out properly placed and operational CO2 sensors to install OA sensors simply because a grouping of credits occurred after a project was designed and constructed.
EQc1 in LEED-NCv2.2 requires air flow measurement devices in each mechanical ventilation system serving non-densely occupied areas. This requirement is to meet the intent of sustaining occupant comfort and well-being through ventilation system monitoring. Use of CO2 sensors in non-densely occupied spaces that meet the requirements for densely occupied spaces under LEED-NCv2.2, in lieu of direct outdoor airflow measurement, meet the intent of EQc1.
**Update October 1, 2013: Applicable credits were updated.
Related Addenda (Corrections & Interpretations)