I just bought a PC fan and an adapter from the University surplus (for a total of $2), then mounted and wired it up in my new Hova Bator. It took all of 20 minutes to do. Now I am testing it out and I'm amazed at how much faster the temps raise up with it. This weekend I am setting my first batch of eggs to test it out before my "good" silkie eggs come in next month. I feel much more confident about keeping a consistent temperature throughout my bator with that fan humming away in it. Thank you so much for having such lovely, clear instructions. Oh, and I did buy and extra fan and adapter to build a second bator with, following your fantastic directions.