Abstract: A hvac damper control is described. In an example, an apparatus comprises a manual actuator, wherein in a manual use of the manual actuator, the manual actuator is configured to open a hvac damper to an open position and close the damper to a closed position. The apparatus comprises an actuator coupled to a manual actuator, wherein the actuator is configured to open and close the hvac damper by being connected to the manual actuator. When the actuator is connected to propulsion, the actuator is configured to drive itself to the open position, wherein the actuator is configured to lock to the manual actuator. In other examples, a method, a hvac damper, and a hvac system are discussed along with the features of the apparatus.

Abstract: A hvac damper control is described. In an example, an apparatus comprises a manual actuator, wherein in a manual use of the manual actuator, the manual actuator is configured to open a hvac damper to an open position and close the damper to a closed position. The apparatus comprises an actuator coupled to a manual actuator, wherein the actuator is configured to open and close the hvac damper by being connected to the manual actuator. When the actuator is connected to propulsion, the actuator is configured to drive itself to the open position, wherein the actuator is configured to lock to the manual actuator. In other examples, a method, a hvac damper, and a hvac system are discussed along with the features of the apparatus.

Abstract: A fresh airflow is conducted from a supply air chamber through nozzles into a ring-shaped mixing chamber. A circulated airflow is conducted from a room space into a cylindrical suction chamber inside a ring-shaped heat exchanger. From the suction chamber the circulated airflow travels through the heat exchanger into the mixing chamber. The nozzles are located in the upper part of the mixing chamber at a distance from each other on the periphery of at least one circle, whereby the mid-point of the circle is located on the vertical central axis of the supply air terminal device. The horizontal component of the direction vector of the fresh airflow discharging from each nozzle forms an angle ?, which is in a range of 45-135 degrees, with the radius of said at least one circle, and the direction vector is directed downward, in relation to the horizontal plane at an angle ?, which is in a range of 15-75 degrees, whereby a rotating airflow directed downward is formed in the mixing chamber.

Abstract: A supply air unit including a supply air chamber, at least one mixing chamber nozzles or a nozzle gap through which a fresh airflow is conducted from the supply air chamber into the mixing chamber, a suction chamber into which a circulated airflow is sucked from an air-conditioned room space, and at least one outlet opening. At least one airflow controller through which an additional airflow is conducted from the supply air chamber into the suction chamber.

Abstract: A supply air unit including a supply air chamber, at least one mixing chamber nozzles or a nozzle gap through which a fresh airflow is conducted from the supply air chamber into the mixing chamber, a suction chamber into which a circulated airflow is sucked from an air-conditioned room space, and at least one outlet opening. At least one airflow controller through which an additional airflow is conducted from the supply air chamber into the suction chamber.

Abstract: A fresh airflow is conducted from a supply air chamber through nozzles into a ring-shaped mixing chamber. A circulated airflow is conducted from a room space into a cylindrical suction chamber inside a ring-shaped heat exchanger. From the suction chamber the circulated airflow travels through the heat exchanger into the mixing chamber. The nozzles are located in the upper part of the mixing chamber at a distance from each other on the periphery of at least one circle, whereby the mid-point of the circle is located on the vertical central axis of the supply air terminal device. The horizontal component of the direction vector of the fresh airflow discharging from each nozzle forms an angle ?, which is in a range of 45-135 degrees, with the radius of said at least one circle, and the direction vector is directed downward, in relation to the horizontal plane at an angle ?, which is in a range of 15-75 degrees, whereby a rotating airflow directed downward is formed in the mixing chamber.

Abstract: Method for decreasing the existence of externally detectable revealing signals, so-called {umlaut over (R)}Ö{umlaut over (S)}, from keyboards (1), e.g. for computers, where the keyboard is fed with signals, so-called matrix signals, which are detected for detection of activity regarding the keys (2) of the keyboard, whereby said matrix signals are generated by means of signal devices. The method is especially characterized in that the matrix signals are high-frequency filtered before they are fed to the keyboard.

Abstract: Method for decreasing the existence of externally detectable revealing signals, so-called {umlaut over (ROS)}, from keyboards (1), e.g. for computers, where the keyboard is fed with signals, so-called matrix signals, which are detected for detection of activity regarding the keys (2) of the keyboard, whereby said matrix signals are generated by means of signal devices. The method is especially characterized in that the matrix signals are high-frequency filtered before they are fed to the keyboard.