Clean rooms are research and manufacturing spaces which require precise temperature and humidity control and must reach very clean dustless environments. Because of this, clean rooms recirculate large volumes of air through high efficiency particulate arresting filters (HEPA). These rooms can have either high or moderate to low internal heat gains depending on the purpose of the clean room. We help customers reduce their clean room energy costs and improve control over their HVAC systems, while maintaining rigorous clean room standards. B2Q identifies energy efficiency and performance improvements, quantifies project economics, and calculates utility incentives. Using design data, balancing reports, particle count data, occupancy level profiles, and gowning practices, B2Q Associates works with our customers on practical opportunities to reduce recirculation and make-up airflows in clean rooms and assembly areas, especially during 2nd shift, 3rd shift, and weekend nights. The allowable airflow reductions for each space are determined using actual particle count data, shift-specific occupancy levels, and ISO/ASHRAE requirements for particle counts and ventilation air.