Abstract: A damper of a heating, ventilation, and/or air conditioning (HVAC) system includes a crank configured to rotate about an axis of a shaft relative to a support, a reset arm configured to rotate about the axis of the shaft relative to the support, a spring coupled to the crank and the reset arm, and a fuse link configured to be coupled to the reset arm and the support in a set configuration and to release the reset arm from the support in response to a temperature exceeding a threshold temperature. The crank and the reset arm are configured to rotate away from the support in a first circumferential direction toward a closed configuration in response to the fuse link releasing the reset arm from the support. A spring force of the spring is configured to increase to enable the reset arm to rotate in a second circumferential direction opposite to the first circumferential direction beyond the set configuration and into a reset configuration.

Abstract: A damper of a heating, ventilation, and/or air conditioning (HVAC) system includes a damper blade having a blade body with a hollow portion extending to an end of the blade body. The damper also includes an axle defining an axis about which the damper blade is configured to rotate, where the axle extends from the end of the blade body. The damper also includes a spring thrust bearing having a spring thrust bearing opening through which the axle extends. The spring thrust bearing is configured to support an axial load of the damper blade. The damper also includes an end cap disposed within the hollow portion of the blade body such that the end cap is flush with the end of the blade body.

Abstract: A firestat for providing an output for controlling an opening and closing of a fire/smoke damper. The firestat includes a fire/smoke damper test switch and an actuator configured to depress the fire/smoke damper test switch. The firestat is further configured to release the fire/smoke damper test switch in response to a depressing force applied to the actuator, wherein melting or other damage to the actuator causes a release of the test switch.

Abstract: A damper of a heating, ventilation, and/or air conditioning (HVAC) system includes a crank configured to rotate about an axis of a shaft relative to a support, a reset arm configured to rotate about the axis of the shaft relative to the support, a spring coupled to the crank and the reset arm, and a fuse link configured to be coupled to the reset arm and the support in a set configuration and to release the reset arm from the support in response to a temperature exceeding a threshold temperature. The crank and the reset arm are configured to rotate away from the support in a first circumferential direction toward a closed configuration in response to the fuse link releasing the reset arm from the support. A spring force of the spring is configured to increase to enable the reset arm to rotate in a second circumferential direction opposite to the first circumferential direction beyond the set configuration and into a reset configuration.

Abstract: A cam assembly for selectively contacting an end-of-stroke damper position switch. The cam assembly includes a first cam that is rotatable about a first axis, and a position lever that is connected to and rotates with the cam assembly. The position lever is configured to be connected to an opening and closing mechanism of the damper and the cam assembly is adjustable to contact a first end-of-stroke damper position switch at the end-of-stroke of the opening and closing mechanism of the damper regardless of the position of the lever.

Abstract: A resetting element for transmitting resetting force to a thermal switch. The resetting element includes a first end and an elastic element configured to transmit a force received at the first end to the reset switch of the thermal switch, wherein the elastic element is prevents damage to the thermal switch by decreasing the force transmitted to the reset switch from the first end.

Abstract: A resetting element for transmitting resetting force to a thermal switch. The resetting element includes a first end and an elastic element configured to transmit a force received at the first end to the reset switch of the thermal switch, wherein the elastic element is prevents damage to the thermal switch by decreasing the force transmitted to the reset switch from the first end.

Abstract: A firestat for providing an output for controlling an opening and closing of a fire/smoke damper. The firestat includes a fire/smoke damper test switch and an actuator configured to depress the fire/smoke damper test switch. The firestat is further configured to release the fire/smoke damper test switch in response to a depressing force applied to the actuator, wherein melting or other damage to the actuator causes a release of the test switch.

Abstract: A cam assembly for selectively contacting an end-of-stroke damper position switch. The cam assembly includes a first cam that is rotatable about a first axis, and a position lever that is connected to and rotates with the cam assembly. The position lever is configured to be connected to an opening and closing mechanism of the damper and the cam assembly is adjustable to contact a first end-of-stroke damper position switch at the end-of-stroke of the opening and closing mechanism of the damper regardless of the position of the lever.

Abstract: An air flow rate meter includes a probe housing having a pass-through opening. The air flow rate meter also includes a sensing circuit coupled with the probe housing and positioned at least partially within the pass-through opening. The air flow rate meter also includes an arm coupled to the probe housing. The arm includes a probe-end on which the probe housing is disposed, a mounting-end opposite to the probe-end, and an angled segment extending at a first angle from the probe-end and at a second angle from the mounting-end.

Abstract: An air flow rate meter includes a probe housing having a pass-through opening. The air flow rate meter also includes a sensing circuit coupled with the probe housing and positioned at least partially within the pass-through opening. The air flow rate meter also includes an arm coupled to the probe housing. The arm includes a probe-end on which the probe housing is disposed, a mounting-end opposite to the probe-end, and an angled segment extending at a first angle from the probe-end and at a second angle from the mounting-end.

Abstract: A damper comprising a tubular duct, a circular blade disposed within the tubular duct and a shaft disposed within the tubular duct, wherein the shaft extends through a hole in the circular blade.

Abstract: An air control damper, comprising a shaft coupled to a frame. A first full blade coupled to the axel and disposed within the frame. A rocker assembly coupled to the first full blade. A first rod coupled to the rocker assembly. A cross-link assembly coupled to the first rod. A half blade coupled to the cross-link assembly and disposed on a first shaft within the frame, wherein the half blade is configured to provide a blade stop for the first full blade in a closed position.

Abstract: A damper comprising a frame, a first blade pivotally engaged with the frame, the first blade comprising a first end portion disposed at an obtuse angle ? with respect to a first blade axis, the first blade comprising a hollow portion for receiving an insulating material and further comprising a first thermal gap for interrupting a thermally conductive path across the first end portion, a second blade pivotally engaged with the frame, the second blade comprising a second end portion disposed at an obtuse angle ? with respect to a second blade axis, the second blade comprising a hollow portion for receiving an insulating material and further comprising a second thermal gap for interrupting a thermally conductive path across the second end portion, a first seal connected to the first end portion of the first blade, a second seal connected to the second end portion of the second blade, the first seal and the second seal disposed to cooperatively engage an adjacent first blade end portion and second blade end port

Abstract: A damper comprising a frame, a first blade pivotally engaged with the frame, the first blade comprising a first end portion disposed at an obtuse angle ? with respect to a first blade axis, the first blade comprising a hollow portion for receiving an insulating material and further comprising a first thermal gap for interrupting a thermally conductive path across the first end portion, a second blade pivotally engaged with the frame, the second blade comprising a second end portion disposed at an obtuse angle ? with respect to a second blade axis, the second blade comprising a hollow portion for receiving an insulating material and further comprising a second thermal gap for interrupting a thermally conductive path across the second end portion, a first seal connected to the first end portion of the first blade, a second seal connected to the second end portion of the second blade, the first seal and the second seal disposed to cooperatively engage an adjacent first blade end portion and second blade end port

Abstract: A damper having a first seal and a second seal disposed to cooperatively engage an adjacent first blade end portion and second blade end portion such that a dead air space is created between the adjacent first seal and second seal in a damper closed position, and a first thermal gap and a second thermal gap disposed within said dead air space in the damper closed position.

Abstract: An air control damper, comprising a shaft coupled to a frame. A first full blade coupled to the axel and disposed within the frame. A rocker assembly coupled to the first full blade. A first rod coupled to the rocker assembly. A cross-link assembly coupled to the first rod. A half blade coupled to the cross-link assembly and disposed on a first shaft within the frame, wherein the half blade is configured to provide a blade stop for the first full blade in a closed position.

Abstract: A damper comprising a tubular duct, a circular blade disposed within the tubular duct and a shaft disposed within the tubular duct, wherein the shaft extends through a hole in the circular blade.

Abstract: A damper having a first seal and a second seal disposed to cooperatively engage an adjacent first blade end portion and second blade end portion such that a dead air space is created between the adjacent first seal and second seal in a damper closed position, and a first thermal gap and a second thermal gap disposed within said dead air space in the damper closed position.

Abstract: An iris damper comprising a housing, a plurality of iris blades moveable to open and close the damper, and the plurality of iris blades comprising a first cooperating pair of iris blades, each iris blade of the first cooperating pair having a linear edge which is cooperatively contactable along a predetermined length (L) with an opposing linear edge of the other iris blade in order to form a substantially gas tight seal between the first pair linear edges when the iris damper is closed.