astragal
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astragal
Standards
a member, or combination of members, applied to one or both doors of a pair at their meeting stiles to close the clearance gap for the purpose of providing a weather seal, minimizing the passage of light or sound between doors or retarding the passage of smoke or flame during a fire
Source - AS 1905.1:2015: Components for the protection of openings in fire-resistant walls
HB50