What size hole for Side Window Fan?

[lt529]

I've got a chieftec dragon case with a side window, and I want to put in a fan on my side window. But I can't seem to find a hole saw that is exactly 80mm. I've only found 3-3/8" hole saws and 3-1/2" ones on eBay. Lowes doesn't have exactly 80mm hole saws either. What size should I go with?

 

[bootoo]

I read on another forum from an australian guy that he uses 72 and 73 mm hole saws which work perfectly for an 80 mm fan. Don't remember how that translates to inches but I went to Orchard hardware and found a fan saw which (in small print) gave that measurement in metrics. Of course at $15 bucks I went home to think again.

 

[0roo0roo]

doesn't have to be exact. as long as theres space for the fan screw holes and its not too small.

dragons don't have window fans? hmm guess only the chieftecs do.