.~ Natural ventilation including air passage through rooftop (i.e., no air pump)
DEFINITION
Classification: 454/250
Natural ventilation including air passage through rooftop (i.e., no air pump):
(under subclass 237) Subject matter wherein the means for admitting air into the ventilated space and means for exhausting air from the space function by means other than an air moving apparatus for forcing air into or out of the space and wherein one of the means comprises an air carrying conduit which passes through an external top barrier of the space.
SEE OR SEARCH THIS CLASS, SUBCLASS:
1+, for chimney or stack structure which may pass through a roof.
