10.3.4 Bottom Exit cabling feature  10.3.5 Frame Bolt-down kit  The Bottom Exit cabling feature (FC 7919) is required for raised floor environments, where I/O  cabling or line cords must exit from the bottom of the frame. This feature includes the  hardware to allow bottom exit, and other components for cable management and filler plates  to preserve the recommended air circulation, as shown in Figure 10-8. A bolt-down kit (FC 8006) is available for the z14 ZR1 servers. The kit provides hardware to  enhance the ruggedness of the frame, the frame stiffener, and to tie down the frame to a  concrete floor.  The frame tie-down kit can be used on a non-raised floor where the frame is secured directly  to a concrete floor, or on a raised floor where the frame is secured to the concrete floor  underneath the raised floor. Raised floors 241.3 mm (9.5 inches) - 1270 mm (50 inches) are  supported. The kits help secure the frames and their contents from damage when they are exposed to  shocks and vibrations, such as in a seismic event. The frame tie-downs are intended for  securing a frame that weighs up to 1308 kg (2885 lbs).  For more information see  IBM 3907 Installation Manual for Physical Planning,  GC28-6974. z14 ZR1 servers require specific service clearance to ensure the fastest possible repair in the  unlikely event that a part must be replaced. Failure to provide enough clearance to open the  front and rear covers results in extended service times or outages.  For more information, see  IBM 3907 Installation Manual for Physical Planning,  GC28-6974.  Figure 10-8 Bottom Exit cabling feature  10.3.6 Service clearance areas 352  IBM 14 Model ZR1 Technical Guide