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: 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.