Completed installation of a new Aprilaire 600 humidifier. Mounted the humidifier on the return air drop ductwork. Ran a water line from water heater to the Aprilaire. Installed the humidistat control on the return duct also, and wired it to the furnace and humidifier. Run tested the humidifier and found it to be operating normal. Thank you for choosing Black-Haak Heating and Electric. Please take a moment to fill out our online survey.