Originally Posted by vee_ess

Well, fan adapters give you one or the other. If you are running a low performance fan, the noise won't increase, but it will push out more air; if you are running a high performance fan, the noise will decrease, but it will put out as much air. This is because you are running a given amount of air through the smaller hole size, except it is eased into the increased pressure (vs. larger hole). I would just suggest getting out the Dremel and increasing the hole. Heck, just put a window in while your at it.