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SECTION
709 SMOKE BARRIERS
709.5
Openings. Openings in a smoke barrier shall be protected
in accordance with Section 715.
Exception:
In Group 1-2, where doors are installed across corridors,
a pair of opposite-swinging doors without a center mullion
shall be installed having vision panels with fire-protection-rated
glazing materials in fire-protection-rated frames, the area
of which shall not exceed that tested. The doors shall be
close fitting within operational tolerances, and shall not
have undercuts, louvers or grilles. The doors shall
have head and jamb stops, astragals or rabbets at meeting
edges and shall be automatic closing by smoke detection in
accordance with Section 715.4.7.3.
Positive-latching devices are not required.
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