Cooling fan??

Ii have noticed that my metabox HD CXCI it does get unbelievably hot I don1t know if it’s a common
Issue or just my box and now I am worried it will cooked, now I’m thinking of fitting a extractor fan or cooling fan. Is it possible? Will it make difference?
If you’ve installed one before could you please share it with us?
Thanks in advance

I take it no one has have done this before i will give it a go and if it's turn to be successful i will post how to.