FWIW i have never run a fan on my lrp sphere. I have a 7.5 in my lazer SP and now FS. I have run it outdoors in hot temps as well.
I don't run a fan on my sphere either but the tc model comes with a fan that is hard wired and in order to remove it and for it to actually look nice you would need to tear apart the case. I run my tc sphere in my B44.