Temperature-responsive automatic ventilator

摘要

An improved foundation ventilator assembly including a housing in which united shutter elements are mounted for pivotal movement between an open and closed position to control air flow through the ventilator. Preferably, a thermally responsive spring is secured to one of the shutter elements to cause pivotal movement of same with changes in ambient temperature. The housing defines openings therein for the receipt of mounting means which are utilized to secure the ventilator assembly within a foundation or other wall opening. The mounting means includes a threaded element in threaded engagement with a pressure element, such that when the threaded element is screwed into the foundation or other wall surrounding the opening, force is applied against the ventilator assembly or at least partially absorbed by the pressure plate. A removably secureable rear cover or screen may also be provided to close the rear of the ventilator assembly.