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The Lennox Y0391 is the correct replacement lamp for the following air cleaner models:
The Lennox Y0391 UV Filtration Lamp Replacement is a replacement UV filter lamp for the Lennox UVC 41W-S and UVC 41W-D Healthy Climate UVC Germicidal Light air cleaners. The UVC041W-S requires only one replacement bulb, while the UVC 41W-D model requires two replacement bulbs. The Lennox Y0391 is a 41 watt bulb and measures 16" in length. Replace this ultraviolet lamp once a year to achieve the best results from your Healthy Climate system.
Lennox Y0391 UV Filtration Lamp Replacement specifications: