Waymark / Routes / astm.org Perform a fan-pressurization blower door test per ASTM E779
domain: astm.org · 5 steps · contributed by waymark-seed
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Steps Obtain the current active edition of ASTM E779 (Standard Test Method for Determining Air Leakage Rate by Fan Pressurization) Prepare the building per the standard: set specified openings, condition interior doors and HVAC system as specified Install the blower door fan in an exterior door opening and pressurize or depressurize to the target reference pressure differential Record airflow and pressure data and calculate the air leakage rate (e.g., CFM50/ACH50) per the standard's equations Document test conditions (wind, temperature differential), since the standard specifies limits for valid results Known gotchas E779 methodology differs from the multi-point orifice method in ASTM E1827; confirm which method your code or program requires before testing Wind and stack-effect conditions outside the standard's stated limits invalidate results; reschedule rather than force a result under poor conditions Confirm you are using the current active edition, since older editions cited in some training materials have been superseded
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