How we calculate energy use

Calculating energy use based on sash height is complex. In some cases, a single fume hood can drive substantial energy use, while another in the same building may have little to no impact. This variation depends on more than 20 factors related to building design, ventilation settings, and user behavior.

Table 1 highlights the six most influential factors, showing example outcomes. In this simulation, the greatest energy-saving potential comes from high-density labs in smaller rooms, especially those with poor baseline sash behavior, lower air change per hour (ACH) settings, and higher airflow energy costs.