Furnace Humidifier Fan Powered Height (In.) 16-3/4 Width (In.) 15-1/2 Depth (In.) 10-3/8 Plenum Opening Required (in.) 14-1/16H x 13-1/2W Max Water Usage (Gal./24 Hrs.) 18 Continuous Drain Color Gray Includes Automatic Damper Status Maintenance Service LEDs