<?xml version="1.0" encoding="UTF-8" standalone="no"?><?Xpress productLine="ncc-clause" ?><clause xmlns:xt="urn:xpressauthor:trackchanges" id="_2f5b30a6-f01c-4efa-a46d-0067d34d5b54" 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>F6P4</sptc><title id="_2dfcd147-57c2-4574-81e8-a9dda0593383">Mechanical ventilation to control odours and contaminants</title><archive-num>2019: FP4.4</archive-num><subclause id="_983f8657-a9e4-47a5-94a9-6466dbe673f3" outputclass="subclause"><title id="_1d9f0fc8-14f7-486b-9780-667f61927382">SubClause</title><num>1</num><p>A mechanical air-handling system installed in a building must control—</p><ol outputclass="alpha"><li id="_4fadc3ad-8e9e-4658-8289-9861b45dad8e">the circulation of objectionable odours; and</li><li id="_23119920-a32a-4543-ba2a-901e9b5f26f0">the accumulation of harmful contamination by micro-organisms, pathogens and toxins.</li></ol></subclause></clause>