(under subclass 349) Subject matter wherein the central heater includes a flue or channel for conveying heated air to different parts or rooms of a building.
SEE OR SEARCH THIS CLASS, SUBCLASS:
479+, for externally heated line connected section.
485+, for heated line section with heating element internal of flow path.
SEE OR SEARCH CLASS
126, Stoves and Furnaces,
99+, for hot air furnaces.
165, Heat Exchange, 120+, for impeller or conveyor moving exchange material.
