Abstract: An air director for balancing air flow during a perpendicular change in air flow direction, comprising a frame defining an outer perimeter and having an inner annular opening therein, a plurality of air-directing vanes positioned on the frame between the perimeter and the annular opening thereof in spaced-apart relation around the perimeter thereof for directing air therethrough from the perimeter and perpendicularly through the annular opening, the vanes positioned on the frame with opposed, major, air-directing surfaces defining a extended line having a predetermined angular offset relative to the radii of the annular opening for swirling the air.

Abstract: A forced air heater for heating a venting air stream including an outer casing, a fan for forcing the venting air stream through the casing, a combustion drum providing a combustion chamber for a burner supported within the casing, a flue gas header spaced downstream from the drum connected in separate fluid communication with the combustion chamber to accommodate evacuation of combustion gases from the chamber through the header, a passage for the venting air stream extending through the casing in heat transfer relation with the drum and header, and a plurality of vanes secured within the casing adapted to circulate a predetermined portion of the venting air stream between said drum and header.

Abstract: A hand brake for a wheeled vehicle comprises an operating shaft carried within a sleeve affixed to the frame of the vehicle to accommodate axial displacement and rotation of the shaft attendant to shifting the brake between respective braking and non-braking positions. A locking lug on the shaft is adapted to engage and secure a receiving member mounted on one of the vehicle wheels upon rotational and axial movement of the shaft into the braking position, and stops on the shaft cooperative with the sleeve to releasably secure the shaft in the respective braking and non-braking positions.