<?xml version="1.0" encoding="UTF-8" standalone="no"?><?Xpress productLine="ncc-clause" ?><clause id="_ca21f638-d15b-4c67-9901-969be4434464" 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>S21C3</sptc><title id="_c9ecefc4-0f91-4fad-9e9e-224b2ca1bfd8">Smoke exhaust fans</title><archive-num>2019: Spec E2.2b: 3</archive-num><subclause id="_a8b09dba-a1b4-45ac-be2b-afed1f849a43" outputclass="subclause"><title id="_6c8ed3d5-77fc-43a6-9dd7-ee5051a17aa7">SubClause</title><num>1</num><p>Each smoke exhaust fan, complete with its drive, flexible connections, control gear and wiring must—</p><ol outputclass="alpha"><li id="_587e5c58-611b-4d1a-9f48-8bccd019eec3">be constructed and installed so that it is capable of continuous operation (exhausting the <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1432_4.0.0.xml#_af6fde9f-147d-4782-8b85-42044e80fd42" id="_dbdbdcf6-14f3-4c09-a8ff-9dd7ce689380" scope="local" type="abcb-glossentry">required</xref> volumetric flow rate at the installed system resistance) at a temperature of 200°C for a period of not less than 1 hour; and</li><li id="_029c4723-bf0b-4a16-aada-9b6b32014c05">in a building not fitted with a sprinkler system, be capable of continuous operation at a temperature of 300°C for a period of not less than 30 minutes; and</li><li id="_ec9f1f33-b110-43b2-bcae-68a810101e10">be rated to handle the <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1432_4.0.0.xml#_af6fde9f-147d-4782-8b85-42044e80fd42" id="_3ea7512f-fbe9-4fb2-8116-bb27e7d0f4dc" scope="local" type="abcb-glossentry">required</xref> volumetric flow rate at ambient temperature to be capable of exhausting cool smoke during the early stages of a fire and to allow routine testing; and</li><li id="_1846c5a1-db3b-42ec-8518-97b98f26b5b5">have any high temperature overload devices installed, <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1199_0.7.0.xml#_ac370c9b-7389-4daa-ac5b-338e11dc43e7" id="_b6991843-85fa-4d04-9471-18cbdfcd1803" scope="local" type="abcb-glossentry">automatically</xref> overridden during the smoke exhaust operation.</li></ol></subclause></clause>