Forced air ventilating device

摘要

An automatically controlled forced air ventilating device for installation in a structural wall and used in controlling the movement of air into and out of a prescribed area. A ventilator apparatus for the device includes a first stationary plate and a second movable plate, each of the plates including apertures therein and a control means for moving the second plate between first and second positions in which the apertures are aligned and not aligned. A fan is attached to the ventilator apparatus for moving air therethrough at times when the second plate is in the second position with the apertures aligned. A sensing means senses prescribed conditions of air and activates the fan and the control means responsive thereto when prescribed levels of air conditions have been exceeded.