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Basically, the manual duct damper is used to control the air flow rate in the ducts and valves, and its function in the air 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, which are disc type 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 adjust the proper aeration. It becomes important if it is 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.
The manual damper is available in two types, round and square. Also, this type of dampers can be supplied with a single-layer vane with a V-shaped geometry or as a double-layer vane 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. Manual channel dampers can be produced in two forms: mutual vanes for more control over the flow rate and parallel vanes to cut off the air flow faster.
Making a manual damper
Manual dampers are made in the form of a single blade, the blade can be opened or closed up to a phase difference of 90 degrees with the help of a lever made of PVC or iron. and as a result of this change in the angle of the blade in the air path of the channel; The flow path is blocked or closed and as a result the flow is controlled
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