Manufacturer Name: Lennox Product Number: 64X36 OEM Part Number: 64X36 The Lennox 64X36 UV Bulb (around 0.3 lbs and measuring 16 Inches long) is a replacement part for Lennox HVAC systems, specifically air conditioners with ultraviolet (UV) air purification capabilities (verification needed for compatibility with other brands). https://www.partshnc.com/uv-bulb