US PATENT SUBCLASS 454 / 254
HAVING INLET AIRWAY

Current as of: June, 1999
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454 /   HD   VENTILATION

254HAVING INLET AIRWAY {11}
255  DF  .~> Pressure regulation
256  DF  .~> Including automatic control means {2}
259  DF  .~> Including backdraft preventer
260  DF  .~> Through roof eaves or rafters
261  DF  .~> Including structure for mixing plural air streams together {4}
270  DF  .~> Sleeved vent for ceiling, wall, or floor (e.g., thimble) {1}
275  DF  .~> Including specific cover or shield for exterior vent opening {1}
284  DF  .~> Including specific air distributor (e.g., register, etc.) {14}
333  DF  .~> With adjustable valve (e.g., damper, etc.) {2}
337  DF  .~> With means for liquid contact
338  DF  .~> With air pump

DEFINITION

Classification: 454/254

HAVING INLET AIRWAY:

(under the class definition) Subject matter comprising means for admitting air to a (ventilated) space.

(1) Note. Subject matter relating to an airway which is not specifically an inlet or outlet airway (i.e., the airway can be used for either) is included in this and indented subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

10+, for chimneys or stacks having inlet airways.

107, for railcars, buses, or trailers having inlet airways.

143+, for other vehicles having inlet airways.