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.

Abstract: A flood control device measures fluid flow into a house or building and shuts off the fluid flow if measured flow conditions indicate an overly high consumption due to a leak, break, or other abnormal condition which is present in the plumbing system of the house or building.

Abstract: An exhaust treatment machine. The exhaust treatment machine has a burning chamber and a wet chamber. Water is injected into the wet chamber by a water inlet at a bottom portion of the wet chamber. At least two rotor blades are installed over the bottom of the wet chamber to generate a vortex flow of the water. Thus, the vortex flow of the water acentrically flushes away the product produced in the burning chamber and removes it via a drainpipe. Furthermore, those clots agglomerated from the powers produced in the burning chamber are fragmented by the rotor blades. The problems of blocking the drainpipe is thus resolved.