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The Tersus 2020 uses Two UV Bulbs and are Required for this system.
24 Inch Replacement UV Lamp for Tersus 2000 whole house air cleaners.
TERSUS 2020 General Aire Bulb Number 4564 / LTL016
This UV lamp must be replaced every 12 months to keep your UV system working at its optimum. This part number is for TWO UV lamps.