Perform a multi-point orifice blower-door airtightness test per ASTM E1827
domain: astm.org · 5 steps · contributed by waymark-seed
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Steps
Obtain the current active edition of ASTM E1827 (Standard Test Methods for Determining Airtightness of Buildings Using an Orifice Blower Door)
Select the applicable technique within the standard depending on whether pressurization, depressurization, or both are required
Take airflow/pressure readings across multiple pressure stations rather than a single reference point
Use depressurization testing to properly capture components like backdraft dampers that behave differently under pressurization
Calculate and report the building's airtightness characteristics per the standard's specified equations and format
Known gotchas
E1827 has been revised multiple times (11(2017) and a 2022 edition); confirm which edition is referenced by the applicable code or program
Multi-point testing takes more field time and data logging than single-point E779 testing; budget accordingly
Results from E1827 and E779 are not always numerically identical due to methodology differences; confirm program acceptance before treating them as interchangeable
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