This Tariff Concession Order (under s.269P, Customs Act 1901) applies Schedule 4 item 50 treatment to imports classified at 8414.59.90 described as “filter-ventilators, protective enclosure, with or without fans”, effective 20 April 2009 until revoked. Mechanically, it provides a tariff concession (lower or exempt customs duty) for those specific imported goods. It affects importers (reducing duty costs) and the Commonwealth (reducing tariff receipts); a CEO delegate decides application and importers must show the goods match the stated description, which alters sourcing and pricing incentives.