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Blue-Tube UV is the original award-winning patented UV light kit for residential HVAC systems. It saves energy and extends the life of the air system by keeping coils and drain pans free of mold and improves indoor air quality by killing airborne bacteria and viruses. Blue-Tube UV was the first low-voltage UV system and is the best-selling such product in the world. TUV-BTER2 comes with a 18-32 VAC power supply and a 2 year lamp.