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As people as said, it’s going to get hot. Now something you could do if you have the cord length is move the tower to the top shelf. Since warm air rises it won’t flow past you to get up so it could alleviate some of the heat. From there you could get a mountable fan above it to blow the heat out the door behind you. Then with the pc out of the way you could do something like this if it can fit in the space and just recline it all the way back to climb in and out.