Roof vent assembly for grain storage bin

Abstract

A roof vent for a grain bin communicates air flow from within the grain bin to ambient air, especially when air is forced through the bin for the purpose of drying the grain therein. The vent includes a housing with a flap closure member in the shape of an airfoil pivotally mounted on a horizontal axis above the center of gravity of the flap member. When sufficient air pressure is developed within the bin, the force of gravity on the flap member is overcome and the flap member pivots to an open position. As air flows over and under the flap member, the airfoil shape of the flap member creates a decreased pressure over the member and a lift force causes the flap member to position itself in an open position with minimal obstruction to air flow through the vent housing providing many operational advantages. Other novel features of the roof vent include a U-shaped rod which stiffens the vent housing economically and without vent passageway obstruction; a novel plastic lip against which the novel flap closure rests and cooperates to drain away condensation, and along with inexpensive plastic pivot brackets on the flap closure alleviate freeze-up of the flap in cold weather and promote smooth, quiet operation of the vent. One embodiment of the vent is adaptable for use where air is drawn into a grain bin through the vent as well as expelled through the vent.