(under subclass 254) Subject matter comprising a means to sense a condition or change of condition which condition or change of condition may or may not occur, which means is effective to activate a separate means for regulating the quantity or direction of the air flowing into the ventilated space.
SEE OR SEARCH THIS CLASS, SUBCLASS:
70+, for automatic pressure regulation of a vehicle ventilating system.
75, for automatic control 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.
340, for automatic pressure regulation of a ventilating system having an outlet airway.
SEE OR SEARCH CLASS
236, Automatic Temperature and Humidity Regulation, appropriate subclasses for automatic control means for controlling temperature or humidity.
