{HEAD ~ Air} is taken in via {TAIL ~ an enclosure front face} from outside the enclosure due to the cooling fans rotation, flows through the interior space of the enclosure, and passes through the backboard 
is taken in via
{ HEAD ~ Air } is taken in via { TAIL ~ an enclosure front face } from outside the enclosure due to the cooling fans rotation , flows through the interior space of the enclosure , and passes through the backboard
HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH