17 GPD Flow Through By-Pass Humidifier featuring GENERALAire's Exclusive E2 Digital Automatic Humidistat, which incorporates manual or automatic mode with outdoor sensor for temperature compensating control. This unit delivers Elegant Styling for today's modern mechanical room. The Model 900 is equipped with patented kinetic trough where water is dispersed uniformly across the pad. We provide a stainless steel valve seat where others do not. Application: Flow-through humidifier that's ideal for most homes. Mounts easily on the warm or return plenum and delivers 17 GPD. Unit Size: 12" wide x 16-1/2" high x 10" deep Plenum Opening: 8-3/4" wide x 12" high