While it's somewhat cool enough to sleep on board without the AC, I'm getting soft, I decided to replace my noisy DC fans. West Marine is having a sale and for once they actually beat Amazon. I have 2 Caframo Bora and 1 Sirocco II fans getting ready to go in. So I don't make more holes, I usually cut a plastic base that screws into the original holes and the fans screw into the spacer. Did the same for my new battery changer and my holding tank monitor.