Abstract: Systems and methods for controlling an exhaust gas fan system. The control system may control one or more components of the exhaust system to optimize system performance and improve energy efficiency. The control system may be designed to maintain a substantially constant pressure in the exhaust header and provide a substantially constant flow through the exhaust fans. The control system may include software and hardware that allow the control system to control one or more of: modulation of one or more by-pass dampers; adjustment of the nozzle outlet area; varying the speed of the fans; the number and staging of fans. By utilizing and controlling one or more of these functions, the amount of energy being used may be minimized/optimized.

Abstract: A radial upblast exhaust fan apparatus including a main housing having a fan housing in the lower portion thereof and an upper housing thereabove. A passive zone is defined between two lateral sections of the upper housing such as to divide the air flow path into two sections. The passive zone section defines a first inner wall and a second inner wall which cooperate with a first outer wall and a second outer wall defined by the upper housing to provide a first exhaust flow path and a second exhaust flow path. These walls are shaped as sectors of conical sections preferably and include end walls to isolate the first exhaust flow path from fluid flow communication with respect to the second exhaust flow path. A fan means is positionable within the fan housing to urge exhaust gases to flow upwardly through the exhaust paths. The walls of the exhaust flow paths are generally arcuate to facilitate exhaust flow.

Abstract: A U-loop air handling apparatus adapted to receive air from a surrounding environment for conditioning and channeling thereof to return ducts. The conditioning includes cooling and filtration thereof such as to be specifically usable in high technology areas requiring extremely clean working conditions. The apparatus includes a fan operatively positioned between an intake section and an output section. The intake section includes a reducing section for receiving air and passing this air through a pre-filter and a cooling coil. Condensation is removed at the cooling coil and a cross sectional area of the channel of air travel is narrowed to a smaller diameter by the reducing section. A fan box receives the conditioned air from the reducing section where it is carried through an inlet box and bell member into the fan. The fan powers the air outwardly into an acoustical box which channels the air parallel and in an opposite direction with respect to the direction of movement of the air within the intake section.