Lab air is not recirculated. Lab spaces use 100% outside air. Outside air is cooled or heated as required, pushed into the labs, and then it is sent back out of the building. The system is designed to handle most normal temperatures.
Office spaces use some recirculated air. The University has directed Building Controls to follow CDC guidelines and use the highest mix of fresh air possible while still maintaining an appropriate temperature range. Temperature extremes will require the system to recirculate more air.