Abstract: This invention relates to an improved design associated with the fabrication and construction of a chimney stack capable of conveying hot gases generated in conjunction with industrial endeavors to a height within the atmosphere sufficient to meet current pollution standards, as well as providing a means to dampen stack vibrations plus incorporating a heat extracting system capable of providing a secondary source of heat for utilization outside of the stack confines. In accordance with the invention, there is incorporated within one overall design, a stack capable of conveying hot gases wherein there is provided means for selectively adjusting the opening appearing at the top of said stack, so as to maintain control over the gas velocity as well as plume rise of emitted gases.