The motorized duct damper is used to control the air flow rate in the ducts and valves, and its function in the ducts is exactly the same as the faucet in the water supply pipelines. For this purpose, it is used both for connecting and disconnecting and for controlling the amount of current. This operation is done by the built-in vanes that are V-shaped in this model. This air flow control is done when there is a need for aeration in one area or in one season of the year and also to control the speed and regulation of aeration. It becomes important to be suitable in different branches of the channel.

Duct dampers are a device to stop or adjust the air flow in the ducts. The damper may be placed on the main line of the air channel, or it may be placed on any sub-line of the room to the room of the channel damper to block the air entering the room that is unused or to adjust the air entering (hot or cold air) to each room. . Dampers of the channels are set to manual and automatic washing. Manual dampers are adjusted by the damper handle that is installed on the outer space of the damper. Automatic dampers are controlled by an electric or pneumatic motor installed on the damper axis in the outer space of the damper. Motorized automatic dampers are controlled by thermostat, potentiometer or central building automation system. Three types of motor dampers are recommended for use in motorized dampers.

Three-state motor: these motors control the dampers in such a way that when the power is connected, the motor starts moving (open or closed) and as soon as the power is cut off, the motor and consequently the damper vanes remain in the same position.
Stepper Motor: These types of motors receive 0 to 10 volts and open 0 to 100 volts accordingly. The easiest way to use this type of damper motor is to use a potentiometer for 0 to 10 volt input.
Return spring motors: These types of motors work as fully open or fully closed. The spring in the motor is collected when the damper is opened and in case of power failure, it closes the damper (normally close). This action can also be the other way around, i.e. the spring inside the damper is retracted when it is closed and helps to open the damper in case of power failure (normally open).

Motorized dampers, like manual dampers, can be supplied in two types, round and square. Also, this type of dampers can be supplied with a single-layer V-shaped blade or a double-layer blade with an airfoil geometry. For better air sealing, if required by the customer, a steel air sealing strip is used on the connecting point of the blade shaft to the frame. It is also possible to add a silicone rubber air sealing strip on the edge of the vane to minimize air leakage when the damper is fully closed. Dampers of motorized channels can be produced in two forms: counter vanes for more control over the flow rate and parallel vanes to cut off the air flow faster.
Construction of motorized damper

Motor channel dampers can be made as single or multiple blades, the blades can be opened or closed up to 90 degrees phase difference with the help of a lever made of PVC or iron. and as a result of this change in the angle of the blades in the direction of the channel air; The flow passage is blocked or closed and as a result the flow is controlled. In motorized dampers, the vanes rotate two by two in opposite directions during opening and closing, and that is why it is called a reciprocating damper.