• Steel Catchfan

The steel catchfans are considered as temporary cantilevered structures with steel framing extended from the building. The use of expansive anchor bolts in erecting the catchfan shall be avoided as far as practicable since the anchor bolt may be loosened by vibration generated during the demolition process. In the case when anchors are used, they shall be applied cautiously with extreme care; and not as a primary support. Extreme care shall be exercised in erecting and dismantling the catchfan to avoid the structural components from accidentally falling off. All the components of the steel catchfan shall be supported, and securely fastened to the lifting appliances or supporting structural element until the installation is completed. Catchfan may be constructed with components of prefabricated steel/metal scaffold. Such use is particularly compatible with metal scaffolds. The design and installation of catchfan using prefabricated metal scaffold components shall be in accordance with the manufacturer’s recommended criteria. As far as practicable, the components of the catchfan shall be prefabricated and fastened by bolt to minimise welding.