Why was one floor’s laboratory ventilation failing to keep up, when it was even the closest floor to the rooftop fans? Some system sleuthing led two engineers to a fitting conclusion.

When you have to individually go verify whether 128 air curtains meant to ensure air balance in the original design’s branch ductwork are still there or not, you’re not having an easy time of it.

After 40 years and other engineering studies, a large university building still suffered from humidity problems. Our intrepid author dug into the data and the dark corners of the building in pursuit of the culprit — or culprits?

An air handling unit that hasn’t worked since, well, ever. Chillers that have to work more often as a result — and an extra chiller just to attack the affected zone. These were the obvious symptoms, but what was the cause?