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The Honeywell UC10W1 that you're looking for is no longer available for sale.
UC10W1 Replacement Bulb for TrueUV Coil Treatment SystemsUC10W1 Replacement 10 watt UV-C bulb. Bulb length approximately 15".
Save Your Furnace Tip #4:
MERV stands for Minimum Efficiency Reporting Value, and measures a filtersí efficiency in removing small particles. The higher the MERV rating, the more particles the filter can remove.