dry-powder fire extinguisher

dry-powder fire extinguisher

One that discharges a fine, dry powder (usually sodium bicarbonate, potassium bicarbonate, or ammonium phosphate) by the pressure of a gas stored in the same container as the powder; generally suitable for class-B and class-C fires.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.