<?xml version="1.0" encoding="UTF-8" standalone="no"?><?Xpress productLine="ncc-clause" ?><clause xmlns:xt="urn:xpressauthor:trackchanges" id="_5a6a22cb-f6e1-4aa6-991b-12d48369798e" outputclass="ncc-clause"><meta><facet building="Class 1a"/><facet building="Class 1b"/><facet building="Class 2"/><facet building="Class 3"/><facet building="Class 4"/><facet building="Class 5"/><facet building="Class 6"/><facet building="Class 7a"/><facet building="Class 7b"/><facet building="Class 8"/><facet building="Class 10b"/><facet building="Class 10c"/></meta><sptc>S43C9</sptc><title id="_7906b03e-881a-40e0-ac3c-85c3b2928ad3">Internal tenability</title><archive-num>New for 2022</archive-num><subclause id="_749dca24-b0db-47ed-a7c2-d00da1f1b669" outputclass="subclause"><title id="_49eff9d1-8a20-4c18-bd24-912065f8b551">SubClause</title><num>1</num><p>To maintain internal tenability throughout the duration of occupancy during a bushfire event, the building must comply with the following:</p><ol outputclass="alpha"><li id="_bfe33b6b-eeae-4cd9-90a8-cdedff7e0f11">An air handling system must be provided that is capable of—<ol><li>being adjusted for full recycling of internal air for a period of not less than 4 hours to avoid the introduction of smoke into the building; and</li><li>maintaining an internal air temperature of not more than 25°C.</li></ol></li><li id="_b6f27e66-5ea4-45b2-8074-b12cdf0d271f">The building envelope must be designed such that if an air handling system <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1432_4.0.0.xml#_a5b45a91-1ac3-44a8-8644-acfc09c225a9" id="_d8db8bd3-832f-4a7d-9eb1-673d4e7c0735" referencetype="Text" scope="local" synctargettext="false" type="glossterm">required</xref> by (a) fails, then—<ol><li>internal air temperatures can be maintained below 39°C; and</li><li>internal surface temperatures can be maintained below 60°C.</li></ol></li><li id="_88e0673a-e943-45fb-9426-2c9cb3c9dbbb">If the building is divided into separate compartments then, for the purposes of (a), each compartment must have a separate air handling system.</li><li id="_d5c55d5c-4bf6-43b2-9b56-dff842c6ed87">Each air handling system <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1432_4.0.0.xml#_a5b45a91-1ac3-44a8-8644-acfc09c225a9" id="_03e26456-ca80-41df-ac1a-869e610bb157" referencetype="Text" scope="local" synctargettext="false" type="glossterm">required</xref> by (a) must be designed to account for the activation of smoke detectors from low concentrations of smoke from external sources, so as to ensure that air-conditioning and other essential systems remain operational. </li></ol></subclause></clause>