Abstract: The invention relates to an auxiliary apparatus for controlling at least one electrically operated functional device (3), which is designed to replace a main unit (5) for controlling the said at least one functional device (3), and which can be plugged into terminals (7, 9, 11) for connecting the latter that are provided for this purpose. The said apparatus (1) comprises, for each functional device (3), a manually operated switch (12) interposed between a line (14) for delivering an electric control potential, this line being intended to be connected to an associated supply terminal (9), and an associated line (16) for transmitting the electric control potential to the said at least one functional device (3).

Abstract: The present invention provides a flow rate regulation apparatus capable of accurately measuring the flow velocity of air flowing through an exhaust duct and carrying out a flow rate regulation with high precision, though said exhaust duct may be short in length. The flow rate regulation apparatus according to the present invention comprises a means for regulating the sectional area of a passage in an exhaust duct, where the passage is formed at the center of said exhaust duct and said passage is shaped to be symmetrical with respect to the center axis AX of said exhaust duct as a basis. Since the passage formed in the exhaust duct by the passage sectional area regulation means is shaped so as to be symmetrical, no turbulence takes place in an air current flowing along the center axis AX of the exhaust duct. Flow velocity can be accurately determined and maintained by using air velocity measurements along the center axis.