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The GeneralAire 4885 is the correct replacement ballast for the following model of UV air purifiers:
The General Aire Regulating Electronic Ballast BL411 provides electrical current necessary to start the UV bulb of your GeneralAire 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 4885 specifications: