Abstract: This invention relates to an improved design associated with the fabrication and construction of a double shell 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. In accordance with the invention, an inner core member thermally insulated is contained within, as well as supported by, an upright outer structural column member, there being selectively positioned on the exterior wall of said inner core member, between said inner core member and said outer structural member, vibrator mechanisms capable of being selectively actuated so as to vibrate said inner core member when desired.