(under the class definition) Structure forming an enclosure for or a cover over a usable space (a room or compartment) and having a fluid guiding port in an outer barrier (wall, ceiling or floor) communicating with the space and the ambient earth or air.
(1) Note. A door or window and/or opening therefor is not a fluid guiding port. See the search notes below for a construction with means forming such a portal opening.
SEE OR SEARCH THIS CLASS, SUBCLASS:
19+, for a closure with top entrance opening for persons or things.
192+, for a fluent material container with a port for the material.
204.1+, for construction with means forming a door or window and/or opening therefor. 220.1+, for a construction with service duct within a barrier.
270+, for a barrier construction with a fluid handling feature within the barrier.
503+, for barriers having a fluid passage formed by modules.
SEE OR SEARCH CLASS
454, Ventilation, appropriate subclasses for a ventilating structure with air directing or controlling features other than mere windows.
