Abstract: A base structure of the system with a pair of center containers each of rectangular form with a square width and height and an elongated length attached along an elongated side of each. A side container may be attached to each side of the center containers. A semicircular shaped inlet port is formed in a top wall of each of the center containers to form a circular inlet port. A vertical duct of cylindrical form may be attached over the inlet port and have a lower portion of constant diameter cross-section and an upper portion diverging outwardly. A fan placed in each center container to cause an air flow toward a center of each center container to be channeled upwardly to exit through the inlet port for air to flow through the vertical duct to exit the open top end. A recirculating air structure may be formed with additional containers.

Abstract: A hingeless door system for a pressure vessel; especially, aeronautic and astronautic crafts. The door system has the following major components: a contour in a pressure vessel wall, a doorway opening, a seal, an upper track, a lower track and a door. The door translocates laterally along the tracks from an open position to a closing position and moves radailly along the tracks to a sealing position against the contour which closes the door opening. The problem solved by the invention is to reduce weight, operational volume and complexity and increase durability of a door system for pressure vessel.

Abstract: A hingeless door system for a pressure vessel; especially, aeronautic and astronautic crafts. The door system has the following major components: a contour in a pressure vessel wall, a doorway opening, a seal, an upper track, a lower track and a door. The door translocates laterally along the tracks from an open position to a closed position and moves radially along the tracks to a sealed position against the contour which closes the door opening. The problem solved by the invention is to reduce weight, operational volume and complexity and increase durability of a door system for a pressure vessel.

Abstract: A hingeless door system for a pressure vessel; especially, aeronautic and astronautic crafts. The door system has the following major components: a contour in a pressure vessel wall, a doorway opening, a seal, an upper track, a lower track and a door. The door translocates laterally along the tracks from an open position to a closed position and moves radially along the tracks to a sealed position against the contour which closes the door opening. The problem solved by the invention is to reduce weight, operational volume and complexity and increase durability of a door system for a pressure vessel.