Abstract: A modular automatic power flow fresh air inlet comprising a housing having fresh air openings between a source of fresh air and a room, having an adjustable static pressure to be ventilated. The fresh air openings may be controlled by a valve plate pivotally connected to the housing at each opening. The valve plates pivot relative to the static pressure in the room. A cable having first and second ends extends through the housing and is connected to the valve plates via a lanyard. A cable control device for moving the cable between a forward position and a rearward position is connected to the first end of the cable. A cable counter weight is attached to the second end of the cable. Moving the cable toward the forward position places tension on the lanyard, causing the valve plate to pivot from the static position toward to the fully opened position. Moving the cable toward the rearward position relaxes the tension in the lanyard, causing the valve plate to pivot toward the static position.

Abstract: An integrally formed air intake apparatus for regulating air flow into a structure such as a barn. The air intake apparatus includes an elongate convex valve seat to minimize contact between the valve seat and its valve and to permit smooth air flow over the rounded valve seat. The apparatus further includes a duct-receiving groove for easily mounting a duct which directs outside air into the valve and a shoulder extending about the duct-receiving groove for bearing against an inner portion of the structure. The housing is molded from one-piece such that the valve seat, duct-receiving groove, and shoulder are integrally formed.

Abstract: An air intake apparatus for an indoor wall of a barn. The air intake apparatus includes a frame structured to mount an insulated valve on either of its sides to accommodate orientation of the valve by a farmer. The frame further includes an integral trim to permit easy connection to the indoor wall and to minimize air flow between the frame and indoor wall.

Abstract: A cupola having a set of upper and lower elongate openings. A pair of baffles are disposed in the cupola so as to capture rain driven in through the upper opening and subsequently divert the rain out through the lower openings. A pair of flanges are affixed to the cupola to deflect wind driven articles away from the lower openings. Air flowing into the cupola, which is mounted on a roof of a building, is directed by a duct to a counterweight valve, which is affixed in the building. The counterweight valve includes a flap which is counterbalanced by a counterweight. The flap opens and closes in response to static pressure in the building.

Abstract: The present invention comprises an air to air heat exchanger having a circular outer housing and a circular exhaust duct lying there within a long the longitudinal central access thereof. A plurality of cone shaped turbulators are secured to a rod supported within and extending along the longitudinal central axis of the exhaust. The outer housing is made of a heat insulating plastic, and the exhaust duct, turbulators and central rod are made of corrosion resistant metals such as aluminum or stainless steel.