The advice covers chutes constructed of removable sections made of steel or non-metallic material, attached to scaffolding. http://[email protected]/suivi_forum/?a%5B%5D=%3Ca+href%3Dhttp%3A%2F%2Fezproxy.cityu.edu.hk%2F%3EH+Frame+Scaffolding%3C%copyright%3E%3Cmeta+http-equiv%3Drefresh+content%3D0%3Burl%3Dhttp%3A%2F%2Fextension.unimagdalena.edu.co%2F+%2F%3E