hot-air furnace[′hä¦der ′fər·nəs]
An encased heating unit providing warm air to ducts for circulation by gravity convection or by fans.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A heating unit enclosed in a casing from which warm air is circulated through the building in ducts by gravity convection or by fans.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.