average-specific-extinction-area
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average specific extinction area (ASEA)
Standards
a measure of smoke obscuration determined in accordance with
ISO 5660-1
or
AS/NZS 3837
, as appropriate to the test undertaken and expressed in square metres per kilogram (m2/kg).
Source - AS 5637.1:2015: Determination of fire hazard properties
HB50
means the average specific extinction area for smoke as determined by AS/NZS 3837
Source - BCA Vol 1 terminology