(under subclass 228) 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 air flowing to, from, or about 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.
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, appropriate subclasses for automatic control means for controlling temperature or humidity.
