Note: Hg-lamps contain mercury. Manage in accordance with disposal laws. Refer to www.lamprecycle.org or call 1-800-9-LENNOX. *MERV = Minimum Efficiency Reporting Value. Describes the filter's ability to capture particles and ranges from 1 to 16. Typical fiberglass filter = MERV 1. The higher the MERV rating, the better the filtration. **One micron = 1/25,000 of an inch in diameter. ***Based on laboratory and field studies. ****U.S. Environmental Protection Agency, "Ozone Generators that are Sold as Air Cleaners: An Assessment of Effective and Health Consequences," August 2006.