At a time when energy keeps going up, the last thing we need is to lose heating and cooling energy from our large buildings. There are large buildings everywhere and they have significant forces acting on them in the way of stack effect, reverse stack effect, wind and HVAC imbalances. All of these effect can also feed on each other. The benefits of air tightness are very difficult to model because of these complexities, but what's critical, is that air tightness can make everything a lot more predictable. From energy use to commissioning of stair pressurization systems, and other mechanical systems.

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