It is suggested to regularly inspect air health’s operation through the view port to make certain the bulb is on. It is also essential to change the UV bulb yearly, as the intensity of the bulb’s output diminishes over time. Studies indicate that after 12 months, ultraviolet output will fall below minimum requirements for protection. Even though a bulb may appear to be operating satisfactorily, output intensity may be significantly reduced. The changing of the UV bulb should be done during yearly furnace or A/C Inspection.