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Can cause severe burns. Disconnect power 15 minutes before removing ultraviolet bulb(s). INSTALLATION Turn off power to air handler before installation. Choose a location for duct-mounting the handle that will allow maximum exposure to the coil, drain pans and internal surfaces of the air handler. The adjustable mounting bracket can be used to angle the bulb to fit in tight applications and to maximize exposure. Ballast can be mounted in the control panel of the air handler or outside of the duc