Note: Hg-lamps contain mercury. Manage in accordance with disposal laws. Refer to www.lamprecycle.org or call 1-800-9-LENNOX. *Based on constant circulation of air in the home. **3000-sq.-ft. home with a five-ton air handler. ***U.S. Environmental Protection Agency, "Ozone Gernators that are Sold as Air Cleaners: An Assessment of Effective and Health Consequences," August 2006.