Abstract: Pattern controllers located in discharge slots of an active beam comprise a series of planar paddles hinged on an axis disposed at an angle to the planar surface of a side of the discharge slot thereby producing discharged air displacement in both the horizontal and vertical directions when the paddles are rotated.

Abstract: A ceiling panel clip to engage the grid structure of a drop ceiling and thereby hold panels of a drop ceiling in place.

Abstract: A Venturi valve has a Venturi housing with a plunger slidably mounted on a control shaft within the Venturi housing. Sliding movement of the plunger along the control shaft is controlled by a compression spring. A hard stop is fixed to the control shaft to limit the movement of the plunger along the control shaft in order to keep the compression spring from over compression and from a resulting loss of accuracy.

Abstract: A low-profile, compact fan coil ceiling unit with closely coupled silencers includes a heating and cooling section, a closely coupled inlet silencer, and a closely coupled outlet silencer. The inlet silencer has a rectangular housing with a downwardly facing entry opening and a side facing exit opening attached to the inlet end opening of the heating and cooling section. The outlet silencer has a rectangular housing with a downwardly facing exit opening and a side facing entry opening attached to the outlet end opening of the heating and cooling section. Baffles to control the flow of air and reduce noise in the inlet silencer and the outlet silencer are provided.

Abstract: An apparatus and method for attenuating the sound generated by a fan powered terminal unit or other equipment in an HVAC (heating, ventilating, and air conditioning) system is described. The apparatus utilizes internal geometry to minimize noise due to air disturbances and aerodynamic effects within the apparatus. Specifically, a silencer is described comprising a casing having an inlet and an outlet; a condensate deflector positioned at the inlet to the casing; at least one baffle being operable to attenuate noise in a gas flowing through the silencer; and an air pathway through the silencer, defined by positions of the condensate deflector and the at least one baffle within the casing. The air pathway is angled or curved to substantially minimize the line-of-sight pathway from the inlet to the outlet.

Abstract: An apparatus and method for attenuating the sound generated by a fan powered terminal unit or other equipment in an HVAC (heating, ventilating, and air conditioning) system is described. The apparatus utilizes internal geometry to minimize noise due to air disturbances and aerodynamic effects within the apparatus. Specifically, a silencer is described comprising a casing having an inlet and an outlet; a condensate deflector positioned at the inlet to the casing; at least one baffle being operable to attenuate noise in a gas flowing through the silencer; and an air pathway through the silencer, defined by positions of the condensate deflector and the at least one baffle within the casing. The air pathway is angled or curved to substantially minimize the line-of-sight pathway from the inlet to the outlet.

Abstract: An apparatus and method for attenuating the sound generated by a single duct terminal unit in an HVAC (heating, ventilating, and air conditioning) system. The apparatus utilizes internal geometry to minimize noise due to air disturbances and aerodynamic effects within the apparatus.

Abstract: An apparatus and method for attenuating the sound generated by a fan powered terminal unit in an HVAC (heating, ventilating, and air conditioning) system. The apparatus utilizes internal geometry to minimize noise due to air disturbances and aerodynamic effects within the apparatus.

Abstract: A variable air volume ceiling diffuser includes a damper that is raised and lowered by a linkage that is controlled by a duct temperature sensor/actuator and one or more room temperature sensors/actuators. The linkage includes a heating slide movable for the heating mode and a cooling slide movable for the cooling mode. The duct temperature sensor/actuator selects the heating slide for movement by the room temperature sensors/actuators in the heating mode and selects the cooling slide for movement by the room temperature sensors/actuators in the cooling mode. The differential movement between the heating and cooling slides moves a roller that engages a profiled cam surface attached to two lever arms. As the roller moves along the cam surface, the lever arms pivot about their axis of rotation so that the damper moves upward to close the air inlet and downward to open the air inlet.

Abstract: A modular floor terminal basket with a damper is mounted in the floor of an occupied space for delivering air from an under floor air plenum to the occupied space above. The modular floor terminal basket with a damper includes a generally cylindrical basket with air inlet openings on the basket side and an air outlet at the top of the basket. A damper is positioned in the basket for movement from a lower opened position to an upper closed position. The position of the damper is controlled by an actuator which in turn is controlled by a thermostat/controller in the occupied space above the floor. The damper is slideably mounted on a damper guide extending from the bottom of the basket toward the air outlet at the top of the basket. The actuator rotates a threaded shaft that engages a threaded collar attached to the damper so that the damper slides up and down along the damper guide.

Abstract: A terminal unit for an air handling system and comprised of a housing having a conditioned air inlet for receiving forced conditioned air in the housing. A main outlet opening and a by-pass air outlet opening are provided in the housing. An air flow path is defined between the air inlet and the outlet openings. An air divider gate is slidingly displaceable transverse to the air flow path to deflect air entering the inlet to one or both of the outlet openings. The divider gate has an outlet obstructing rear end and an upstream deflecting face. A linkage assembly is connected to the divider gate to displace the gate across the flow path to simultaneously open one of the outlet openings and close the other, in equal proportions, as desired, while maintaining a substantially constant total outlet opening area as well as maintaining substantially constant inlet air flow conditions.

Abstract: A constant air pressure unit for an air handling system. The unit comprises a housing having an air inlet opening for admitting pressurized air into the housing. The housing has a top wall with a by-pass opening therein and a door is displaceably retained over the by-pass opening. The door has a predetermined load whereby the door is caused to lift away from the by-pass opening when the pressure of the air in the housing is equal to the pressure required to lift the load. The door load defines a maximum housing pressure. In the case where the pressure at the inlet opening starts to increase above the predetermined maximum housing pressure, the door lifts and by-passes the excess pressurized air and thus limits the inlet and housing pressures. In a corollary unit, an air outlet opening for releasing air is included. A pressurized airflow path is defined between the inlet opening and the outlet opening.