Mechanically, this Order applies Schedule 4 item 50 of the Customs Tariff Act 1995 to a specified class of programmable, air‑filtered and ventilated isolation chamber machines (including integrated hydrogen peroxide vapour sterilisers, bio‑decontamination airlocks and glove ports). It takes effect from 26 August 2011 and continues until revoked under ss 269SC or 269SD. Importers of these machines receive the Schedule 4 tariff treatment (reducing customs duty exposure); the Commonwealth forgoes the equivalent tariff revenue and importers must correctly classify goods to rely on the concession.