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My old air purifier has a rusty circular object connected to the amber light bulb close to the ozone plate cage. What is that and should I have it replaced?


That's the radio wave antenna that has rusted. This antenna is part of the ionizing mechanism within the unit. Rusty antenna may negatively affect this function of the unit, since ionization is what brings airborne particles down to the ground from the air. Radio wave ionization helps to bring larger particles out of the air, while needle point ionizer brings down small particles. If the radio wave antenna has rusted, you can bet other parts within the unit have rusted as well, either because of moisture and/or humidity getting inside the unit. Please refer to the repairs page to see if parts are still available for your model and if it could be repaired, plus other options available.