Rating System

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

Rating System Version

v3 - LEED 2008, v2 - Schools 2007, v2 - LEED 2.2, v2 - LEED 2.1, v2 - LEED 2.0

Inquiry

Our project is a laboratory building with several different occupancies. We intend to meet the requirements of this credit (LEED 2.1) as follows: System 1) Office Area. This area consists of one conference room and two floors of private offices and open office areas. We will provide three CO2 sensors: one in the conference room and one at breathing level near a return grille in one of the open office areas on each floor to provide a representative reading for all the offices on that floor. The AHU will have a direct outdoor airflow measurement device and the outdoor air will be kept constant during occupied hours. (This conference room would not be considered a densely occupied space per LEED 2.2). System 2) Laboratory Spaces. These rooms will be provided with 100% outside air and 100% exhaust. The CIR ruling of 8/4/2003 stated that a lab space "would require some instrumentation to report on the resulting IAQ conditions to capture the point. CO2 sensors per se may not be required, but a monitoring system for the lab spaces should provide feedback in a form that affords operational adjustments." We propose using the thermostats as a means to monitor the lab IAQ. Thermostats located in the breathing zone would only be satisfied if the supply air (100% OA) was reaching the breathing zone. Operational adjustments to the air distribution system would be made as a result of low occupant comfort should the ventilation effectiveness be low. System 3) Electron Microscope Imaging spaces. These four rooms will be provided with minimal outside air due to the low occupant load relative to the equipment cooling load. We will provide a CO2 sensor in one of the four rooms at breathing level to provide a representative reading for these rooms. The AHU will have a direct outdoor airflow measurement device and the outdoor air will be kept constant during occupied hours. System 4) Clean Rooms. This large room is served by one large AHU, capable of providing 100% OA, and eight smaller recirculating AHUs. The clean room function requires that the outside air and exhaust air be maintained to keep the space positive at 0.02 inches. We will provide a CO2 sensor near the return at one of the circulating AHUs to provide a representative reading for this area. The large AHU will have a direct outdoor airflow measurement device. Do the quantities and locations of the CO2 sensors satisfy this credit for Systems 1, 3 and 4? Will the room thermostats suffice as a monitoring system as discussed for System 2?