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AirtightnessDescribes how well the building envelope resists air leakage and is measured in air changes per hour (ACH) at 50 pascals (ACH@50 Pa). The fewer air changes per hour, the more airtight the building envelope is. Equivalent leakage area (ELA) is another way of describing the airtightness of the building envelope. It represents the size of a single hol [..]
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AirtightnessPart L of the Building Regulations specifies maximum values for the air permeability of dwellings, commercial and public buildings. (see also: Refurbishment: Airtightness
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Airtightness
The quality of being airtight.
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