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The GeneralAire 4881 is the correct replacement ballast for the following models of UV air purifiers:
The General Aire Regulating Electronic Ballast BL410 provides the electrical current necessary to start the UV bulb of your air purifier, and regulates the amount of continuous electrical current that goes to the bulb while operating. This UV air purifier replacement ballast uses 120/240v electrical current.
The GeneralAire 4881 specifications: