For my grow room i bought a small black masonry mixing tub at home depot. I place a small home made drying rack "A" type and covered to top side of each slope with
black plastic mesh. I then place some of that black plastic air conditioner filter material on top of each slope to act as a "wick". Inside the frame I used PVC
pipe for a simple sprayer, using mister heads pointed up and onto each underside of the material. The black five gallon bucket sits just outside the long end of the mixing tub/tray. On top of that is a small electric fan. The concept is simple. The timer turns on for the misting (three minutes), then the fan timer will run for ten minutes blowing on the wet cloth surface. I never have too much water accumalate in the bottom of the top as that too evaporates but you could elevate the tub/tray and have a run off tube drain the water back into the 5 gallon reservoir. It is the same principle of a home humidifier which costs $125.00, this cost me $25.00 as I had an extra
aquarium pump.