Abstract: A pneumatic conveying air velocity control apparatus comprising multiple pneumatic lifts including multiple cyclones, at least one manifold, and multiple pneumatic conduits intercommunicating the cyclones with the manifold and having a structure defining a venturi with a venturi inlet side and a venturi throat. Multiple sets of a first, second, and a third 2-way valve for each of the pneumatic lift are provided. The first 2-way valve pneumatically communicates with a pneumatic actuator and with a controller, and the second 2-way valve pneumatically communicates with the venturi inlet side and the controller; and the third 2-way valve pneumatically communicates with the venturi throat and the controller for detecting the pneumatic flow rate through the pneumatic conduit. A sequencer is provided for mechanically engaging at least one set of 2-way valve at any given time. A method for controlling the pneumatic velocity in a multiple lift pneumatic conveying air velocity control apparatus.

Abstract: An improved air stabilization system and method used in a refrigerator of a meat packing plant or the like. The improvement comprises positioning rotatably a single mixing damper blade within a damper blade housing such as to regulate the air flow through air openings within the housing.

Abstract: An improved air stabilization system and method used in a building ventilation system. The improvement comprises positioning rotatably a single mixing damper blade within a damper blade housing such as to regulate the air flow through air openings within the housing.