Importance

Loading Importance Indicators...

Abstract

A roof-mounted apparatus is disclosed for discharging exhaust gas at a high velocity. The apparatus includes a stack having a tapered annular cross-section for achieving a relatively high discharge velocity for exhaust gas so that the effective height of the stack is equivalent to that of a considerably taller conventional chimney. The tapered annular stack preferably includes an outer wall and a coaxial inner wall which tapers outwardly toward the outer wall from the bottom to the top of the stack. An in-line fan having an annular outlet which communicates with the bottom of the tapered annular stack is preferably included for impelling exhaust gas admitted to the inlet of the fan into the stack. The inlet of the in-line fan preferably communicates with the outlet of a mixing chamber which is included for mixing diluent fresh air with exhaust gas admitted to the inlet of the mixing chamber through the roof of an industrial plant for diluting the exhaust gas as well as increasing the volume of gas to be discharged in order to achieve the desired discharge velocity. Other features, such as a system for cooling the motor included in the in-line fan, are also disclosed.

Loading the Abstract Image...

First Claim