Contact time and the length of time the labs are in use. Combine research labs with teaching labs. Hire a staff person to set up and take down labs. Larger labs could be multipurpose. If the hoods are running in the lab it is not conducive to teaching or lecturing.
Some departments have unique demands.
Organic, Equine etc. Goal to have the complete set of diagrams by the end of this quarter. Where efficiencies can be used be sure to make use of them. Look at utilization not just function.