What determines where stack pressure is measured?

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The determination of where stack pressure is measured is primarily influenced by the location of exterior pressure taps. Stack pressure refers to the pressure differential created by the temperature difference between indoor and outdoor air, which can drive air movement. To accurately assess stack pressure, pressure taps must be strategically placed at points where they can measure the effects of this differential effectively.

The exterior pressure taps need to be positioned correctly on the building's envelope to capture the influences of wind pressure, as well as the thermal stack effect, which can vary depending on height and geometry. These taps allow for the assessment of pressure differences that can impact the overall air leakage rates and performance of the building's envelope. Therefore, the correct option emphasizes the importance of these measurement locations in understanding how stack pressure functions in relation to the entire building’s performance in terms of airtightness.

In contrast, the size of the building, the types of materials used in construction, or the number of floors might affect overall airtightness, energy performance, or structural integrity, but they do not dictate the specific placement of pressure measurement devices. Consequently, while these factors may play a role in the broader context of building performance testing, they do not directly influence where stack pressure is measured.

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