<?xml version="1.0" encoding="UTF-8" standalone="no"?><?Xpress productLine="ncc-clause" ?><clause id="_7d3c56a7-8d4c-43b1-9551-328677cc75c7" outputclass="ncc-clause"><meta><facet building="Class 1a"/><facet building="Class 1b"/><facet building="Class 10a"/><facet building="Class 10b"/><facet building="Class 10c"/></meta><sptc>S21C5</sptc><title id="_a54026aa-7952-4ecc-a779-c4cb68079c90">Smoke exhaust fan and vent location</title><archive-num>2019: Spec E2.2b: 5</archive-num><subclause id="_831a14f3-a899-41da-9bc8-09639d33039a" outputclass="subclause"><title id="_59f5d09c-8b52-418c-85c0-014614db1dcc">SubClause</title><num>1</num><p>Smoke exhaust fans and vents must be located—</p><ol outputclass="alpha"><li id="_ef3254f8-6f38-438d-881a-9bb81e22c95c">such that each smoke reservoir is served by one or more fans with the maximum exhaust rate at any one point limited to avoid extracting air from below the smoke layer; and</li><li id="_10aa8ee8-dc5a-41e8-a269-2d5c302c1772">to prevent the formation of stagnant regions resulting in excessive cooling and downward mixing of smoke; and</li><li id="_cf2da9a8-e108-407d-882d-ce87fa50f79d">at natural collection points for the hot smoky gases within each smoke reservoir having due regard to the ceiling geometry and its effect on the migratory path of the smoke; and</li><li id="_de358397-a526-44b4-b2a2-20cb0ebe5700">away from the intersection of walkways or malls; and</li><li id="_749578cc-3696-49f4-a1f0-1258b51f6108">to ensure that any voids containing escalators and/or stairs commonly used by the public are not used as a smoke exhaust path; and</li><li id="_0a01a2b4-f30f-4b74-9e0a-1322d87019ea">to discharge directly to outdoor with a velocity of not less than 5 m/s, at a suitable point not less than 6 m from any air intake point or <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1263_2.3.0.xml#_9712f630-8cf7-401b-b1cc-ae0be4485915" id="_dd2414d5-9df2-41e7-9e3d-e872eee929eb" scope="local" type="abcb-glossentry">exit</xref>.</li></ol></subclause></clause>