US PATENT SUBCLASS 110 / 147
DRAFT REGULATORS
Current as of: June, 1999
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DEFINITION
Classification: 110/147
(under the class definition) Devices which act directly on the products of combustion after they leave the firebox to affect the velocity of said products. Also devices that act directly on the fire as blowers for the fire, in combination with steam or air jets that either increase or decrease the draft; and exhaust mechanisms that have exhaust nozzles.
(1) Note. Where air or steam is injected into the products for the sole purpose of more completely consuming the smoke and gases, such devices are classified in this class, see subclasses 297+, for feeding air or feeding steam.
SEE OR SEARCH CLASS
126, Stoves and Furnaces,
285+, for ordinary dampers for stoves and furnaces and their operating mechanism.
236, Automatic Temperature and Humidity Regulation, appropriate subclasses for automatic damper controls.
417, Pumps, 151+, for jet pumps.
454, Ventilation,
1+, for chimney or stack structure, per se.
