文档介绍:Graduations and test methodsof air permeability,watertightness,
wind load resistanceperformance for building external windows and doors
(ISO 6612:1980(E)Windowsand door height windows-Wind resistancetests,
ISO 6613' 1980(E)Windowsand door height windows-
Air permeability test, NEQ)
air flow through a unit area