scope:

This Standard specifies requirements for the testing (see Appendix A), installation, and maintenance of fire-resistant doorsets used to protect openings in walls and partitions, which are required to resist the passage of fire. NZS 4520 also applies to transom panels over doors, where the panels are contained within the door frame and form part of the doorset.

This Standard does not apply to lift-landing doors.

NOTE -

(1) Where it is intended to install the fire-resistant doorset in high traffic areas, it is recommended that it be tested in accordance with Appendix A prior to fire testing and that it complies with the requirements set out therein.

(2) A panel above or to the side of a doorset, which is not contained within the door frame, is considered to be part of the wall and is therefore subject to the structural adequacy, integrity, and insulation requirements set out in the Compliance Documents to the New Zealand Building Code (NZBC).

(3) A smoke-control system (or other external environmental conditions) can impose forces which may override the strike plate. In such circumstances a substantially greater resistance force may be required of the strike plate to ensure the door remains in the latched position during a fire emergency but without exceeding appropriate door opening forces.