Regarding laboratory ventilation, there was confusion introduced in 2004 when the occupancy
category “Science Laboratory” which was under the “Educational” spaces section was introduced.
This category had a fresh air minimum requirement of 0.18 cfm/sq. ft (0.9 l/s/m²) or about 1.2 ACH
for a room with a 9 foot ceiling. There was also a higher exhaust requirement stated of 1 cfm/sq. ft
or about 6 ACH that was listed for a different category labeled as “Science Lab Classrooms” in the
Minimum Exhaust Rates table (6-4). The latter was intended to refer to non-college/university