I looked for an oust fan or something similar but didn't see anything that worked as well. I ended up buying one along with the last 2 lbs of beads. It's $12 something from heartfelt and the prod desc says the fans are no longer produced. I don't know for sure that its true but the fans run cool & quiet, last long on a single D battery (included by the way) and it evened out the upper and lower Rh almost instantly. I was considering getting another but the one seems to be working well enough. I have it on the shelf right next to one of the bead packs.