(under subclass 69) Subject matter comprising (1) means to sense a condition or change of a condition and (2) means responsive to the sensing means to effect a change in flow of the air.
(1) Note. The condition or change of condition may be related to air temperature or moisture content, for example.
SEE OR SEARCH THIS CLASS, SUBCLASS:
70+, for automatic pressure regulation of a vehicle ventilating system.
229, for automatic control of a forced recirculation ventilating system.
238, for automatic pressure regulation of a ventilating system having both inlet and outlet airways.
239, for automatic control of a ventilating system having both inlet and outlet airways. 255, for automatic pressure regulation of a ventilating system having an inlet airway.
256, for automatic control of a ventilating system having an inlet airway.
340, for automatic pressure regulation of a ventilating system having an outlet airway.
SEE OR SEARCH CLASS
236, Automatic Temperature and Humidity Regulation, for such systems, per se.
