I just finished setting up my existing floor model humidor. I used 2 - 12V CPU fans from Radio Shack and a selectable power source (3-12V) which allows me to vary the fan speed. I have 1-1/2 lbs of beads; broken up into multiple dishes on various levels. The top shelves currently have my singles and I will leave the bottom levels to age boxes. I am awaiting a nice 350 ish count humidor from Ed @ Waxingwood which will hold my CC's and higher end singles for aging as well. Can't wait to fill'em all up.