709.5 Openings.
Openings in a smoke barrier shall be protected in accordance with Section 714. Opening protectives shall have a minimum fire-protection rating of 20 minutes.
Exception: In Group I-2, where such doors are installed across corridors, a pair of opposite swinging doors without a center mullion shall be installed having vision panels with approved fire-resistance-rated glazing materials in approved fire-resistance-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 automatic-closing devices. Positive-latching devices are not required.
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