PowerEdge R510-12 has redundant fans stacked in modules.
Figure 24. Fan Module for R510-12
4.9.2Fan Location and Installation
PowerEdge R510-4 has four fan modules (it does not have the fan circled in red as shown in Figure 25). PowerEdge R510-8 has five fan modules. PowerEdge R510-12 has five redundant fan modules which contain 2 fans each for a total of 10 fans.
