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well ventilated airspace

Standards
an airspace in which the openings between the airspace and the external environment are equal to or exceed—
  1. (a) 1500 mm2 per metre of length (in the horizontal direction) for vertical airspaces; and
  2. (b) 1500 mm2 per square of metre of surface area for horizontal airspaces.
The term ‘unventilated’ is used to conform to ISO 6946 . The AIRAH Handbook uses the term ‘non-ventilated’ which, for the purposes of this Standard, is considered the same as ‘unventilated’.
Source - AS/NZS 4859.2:2018: Thermal insulation materials for buildings