Are flat metal Astragals required to be UL APPROVED when attached to fire rated doors and smoke doors?
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FYI, most fire rated fire and smoke doors do not require an astragal. Astragals on double doors most always require a door coordinator to prevent the door leaf without an astragal from hanging on the astragal.
Astragals fall into the category of builders hardware. The door manufacturer will provide specifications in terms of what types of builders hardware may be attached to the door without violating the doors listing and rating as an assembly.
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