Complete with matching splice covers, insert devices suitable for hangers rods, etc. required to be supported. iii) Secured to overhead concrete using unit anchors as specified hereinafter, set through pre-punched holes in C-channel webs at an appropriate space. c) Unit Anchors i) Manufacturer’s standard type of steel insert bolts designed for use in hardened concrete, with pre-tested and pre-determined load values and in various types and sizes suitable for varying installation requirements. ii) Each unit selected in accordance with manufacturer’s certified load carrying tables, as approved. iii) Each unit selected to safely support work required and when under full load conditions and as appropriated for strength or condition of concrete to which attachment is being made. iv) Determine selections using factor of safety not less than five (5) times actual or real load to be supported. d) Other Connections i) Heavy items to steel framing - Machine bolt, nuts and washers set through drilled holes. ii) Light items to steel framing - Machine screws set into drilled and tapped holes or set through drilled holes with nuts and washers. iii) Light items to sheet metal - Headed fasteners with threads designed for sheet metal work, self-drilling, self-tapping. iv) Sizes - Appropriate for loads to be supported and as approved. e) Not Permitted in Lieu of Attachments as Specified. i) Wood blocks embedded in concrete. ii) Wood, fibre, plastic or lead type inserts. 11. Anti-Vibration Bases and Hangers a) Anti-vibration bases and hangers are required for all equipment that is subject to creating vibration at any stage of its operation. b) Anti-vibration bases and hangers shall be designed by the Contractor. c) The design shall be coordinated with concrete foundations, bases and plinths. d) Types and specifications and products or standard prototypes shall be of one (1) manufacturer regularly providing items of the type required. e) The bases shall be secured to supporting construction using bolts with sound-deadening grommets.