Abstract: A ventilation valve (1; 101) for ventilation of a space for keeping animals or plants includes an opening-defining circumferential framework (3; 103) for mounting in a wall of that space, and a movable panel (5; 105). The panel (5; 105) is movably attached to the framework (3; 103) for relative movement between a fully closed position, in which substantially no air can pass between the framework and the panel, and a fully open position, in which substantially the complete opening is available for passage of air. A profiled edge on the framework provides a non-linear relation between a passage opening and an opening position of the panel (5; 105). Also provided is a system for ventilating the space, having at least a single ventilation valve, and for periodically determining parameters of inside air in the space, and adjusting the opening position of the valve based on the parameters.

Abstract: An air tower adapted to be located within a compartment of a refrigeration appliance comprises a first plenum chamber in fluid communication with a first compartment of the refrigeration appliance, a second plenum chamber in fluid communication with a second compartment of the refrigeration appliance, a damper connecting the first plenum chamber to the second plenum chamber, and a movable part within the damper configured to be moveable between a first position and a second position. When moved to the first position, the movable part is relatively closer to interior side walls to thereby restrict air flow from the first plenum chamber to the second plenum chamber. When moved to the second position, the movable part is relatively further away from the interior side walls to thereby permit more air flow from the first plenum chamber to the second plenum chamber.

Abstract: An air conditioning apparatus has a cool-side door device and a heating-side door device between an evaporator and a heater core. The cool-side door device is configured to open and close a cool air passage through which a cool air generated by the evaporator flows. The heating-side door device is configured to open and close a heating air passage through which the cool air flows to be heated by the heater core. At least one of the cool-side door device and the heating-side door device is constructed of a plurality of doors. The plurality of doors is configured to begin to open successively when being opened from a fully closed condition.

Abstract: A control device for gas is provided with a pivotable flap mounted between side walls of a guide duct. A receiving pocket for the insertion of a drive element (motor) is provided on one of the side walls and is oriented in such a way that, after insertion, the output shaft of the drive element is in engagement with the flap. This receiving pocket may be arranged so that the drive element is inserted coaxially with respect to the pivot axis of the flap or transversely thereto, or if the receiving pocket extends into the interior of the duct, the pivot flap is provided with a corresponding cut-out.

Abstract: An opening/closing apparatus of a damper for adjusting a blowing amount of air out of an air diffuser comprises a case mounted at the center of the diffuser in a predetermined size and shape and having an indicating scale portion to be properly positioned at the front surface thereof; a rotating shaft passed through the center portion of the case and extended in a predetermined length out of the case; a rotating manipulation portion including a knob integrally fixed to one end of the rotating shaft; and an indicating operation portion cooperated with the rotating manipulation portion to enable an indicator to direct the indicating scale, thereby confirming the exact opening or closing degree of the damper.

Abstract: A device for monitoring and modulating the admission of fresh air into a building. The device comprises a housing; a sensor associated with the housing and operable to measure airflow through the housing; and a damper including at least two damper blades. Each damper blade includes a shaft rotatably attached to the housing at least at a first shaft end. The shaft is located on the surface of the damper blade so as to divide the surface into first and second substantially equal areas.

Abstract: A device for monitoring and modulating the admission of fresh air into a building. The device comprises a housing; a sensor associated with the housing and operable to measure airflow through the housing; and a damper including at least two damper blades. Each damper blade includes a shaft rotatably attached to the housing at least at a first shaft end. The shaft is located on the surface of the damper blade so as to divide the surface into first and second substantially equal areas.