The Unitec boss is apologising to thousands of affected Auckland students after asbestos was discovered in a multi-level building at the Mount Albert campus.
In a statement, chief executive Gus Gilmore said the university was quick to respond, but acknowledged the decision might be unnerving to those who regularly use the block's five buildings.
"We understand and apologise for the disruption this will cause. However, we take our responsibility to maintain the health and safety of our staff and students very seriously.
"Protecting their health and wellbeing is imperative while we gather more conclusive and sound data on the level of risk posed."
A 6m perimeter has been set up, and affected classes will be moved online while further testing is conducted to find the source of the hazardous mineral. Testing on Wednesday identified "unacceptable" levels of asbestos, finding examples on landings, window sills, and other external areas.