New Efficiency Standards for Furnace Fans

The U.S. Department of Energy has proposed new energy efficiency
standards that would address a source of major energy loss that may be
lurking in your basement, according to the American Council for an
Energy-Efficient Economy.

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[source: http://www.buildings.com/article-details/articleid/16467/title/new-efficiency-standards-for-furnace-fans.aspx]