This flow-through by-pass humidifier is made of plastic and operates at 24 volts. It measures 8-1/2 inches length x 12 inches width x 12-1/4 inches height x 8-1/2 inches depth and has a coverage area of 3200 square feet. The humidifier has a 9-1/8 x 9-1/8 inches plenum opening size
