How is repeated two-point testing defined in air leakage measurement?

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Repeated two-point testing in air leakage measurement is defined by the practice of taking measurements at two specific pressure points, typically starting with the higher pressure point. This method allows for a thorough analysis of the building's air leakage characteristics by capturing data at different pressure differentials which can affect the air flow characteristics through the building envelope.

Starting the process at a higher pressure point often ensures that the data collected reflects the building's performance under more extreme conditions, which can be critical for understanding how well the building can resist air infiltration. This approach is essential to provide a clearer picture of the variability in air leakage across the pressure range, as building envelopes may have different performances at varying pressures.

The emphasis on taking readings starting from the higher point provides consistency and a controlled approach to testing, helping to eliminate variability that could arise from measuring at different starting points. Such a method is beneficial for producing reliable data and aids in making informed decisions regarding the building’s airtightness and potential areas for improvement.

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