.~ Related to wall, floor or ceiling structure of a chamber {3}
54
.~.~ In a chamber connected passage traversing the structure
DEFINITION
Classification: 165/54
(under subclass 53) Apparatus in which the heat exchanger is in a flow path that includes a passage providing communication between the inside and outside of the chamber.
SEE OR SEARCH CLASS
237, Heating Systems,
46+, for a heating system with means for withdrawing stale air from the heated chamber.
454, Ventilation, appropriate subclasses for apparatus and processes for supplying air to or removing it from enclosures where there is neither particular structure of the heat exchanger nor any particular relationship between the heat exchanger and the enclosure ventilated.
