We will provide and install the Aprilaire 600A humidifier. Completed installation of an Aprilaire 600 humidifier. Mounted the humidifier on the return drop and ducted the bypass to the supply plenum. Ran control wiring from duct mounted humidistat to the furnace and connected them. Run tested the humidifier for proper operation. Thank you for choosing Black-Haak Heating and Electric. Please take a moment to fill out our online survey.