Ballast running hot

My 600 Watt electronic HPS ballast seems to be running hotter than usual. I was wondering if there is some type of fan mount made for ballasts to stop them from getting so hot. I've already had to send ballasts back and I would like to extend the life span of this one if possible.

Does something like the fan below exist for ballasts?

http://www.ebay.com/itm/like/331050597546?lpid=82

idk but u can make a ghetto one tho

Ha yea. That was the plan unfortunately. But since I need to order a fan anyway I was curious if anyone had any suggestions.

Thanks for the reply