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Dampers: Types and How They Work

Dampers are more than just airflow adjusters. They are essential components of any complex system, helping to control air quality, maintain worker safety, and more. Large, complex systems should be equipped with a variety of dampers to ensure proper air quality and safety. There are many different types of dampers, so you can choose based on your system’s needs and your budget. Listed below are some of the most common types of dampers, and how they work.

Motorized fire dampers

There are various types of motorized fire dampers. The most common type is a spring return on/off actuator, which closes the damper mechanically. These are designed to close quickly, typically in under 15 seconds. There are many different configurations for MFDs, including vertical, horizontal, and multi-directional. This makes them suitable for both large and small buildings. Listed below are a few advantages of MFDs.

Motorized fire dampers are specially designed to shut off the air supply to a particular area of the HVAC system, preventing the smoke and fire from spreading through the ducts. These dampers have electric or pneumatic actuators that can be controlled by a fire alarm or a heat detection system. They also shut off the flow of air in the HVAC system when they detect high temperatures in the immediate area. They are extremely useful in buildings where there is an air conditioning unit.


KAD Air Conditioning is an ISO certified company that manufactures high-quality motorized fire dampers. Its products include UL-classified fire dampers, UL-listed fire dampers, motorized smoke dampers, and volume control dampers. Additionally, KAD Air Conditioning is one of the leading manufacturers of dampers in the UAE. Customers can contact them directly for more information on damper specifications and pricing. Aside from motorized fire dampers, KAD also offers a wide variety of other ducting products.

While fire dampers are essential for protecting buildings from blazes, smoke dampers are also important for preserving the integrity of physical smoke barriers. Smoke dampers are installed in air conditioning ductwork, ventilation ductwork, and at egress doors and windows. They can limit smoke to a specific zone and assist with a building’s gas suppression system. When installed properly, smoke dampers can prevent smoke from spreading throughout the entire building.

Opposed blade dampers

Compared to parallel blade dampers, opposed blade dampers generate less turbulence downstream. They deflect air streams by limiting the amount of airflow in unused areas, which reduces energy expenditure at the CRAC unit level. Because they deflect airflow, they have a similar pressure drop as a parallel blade damper. This difference is significant, because opposed blade dampers would negatively impact the outlet throw pattern of a diffuser.

Typically, OBD Opposed Blade Dampers used in supply and exhaust air systems. They mounted directly behind the supply air grille and are designed to allow manual adjustment through the grille. They can be ordered in a wide range of standard sizes, as well as custom-made options to meet specific requirements. For those with smaller spaces, the OBD Opposed Blade Damper is an excellent solution. However, it is important to note that it may increase noise levels.


Parallel and Opposed Blade Dampers

Parallel and opposed blade dampers are similar in their use but are more effective for applications with a more controlled damping effect. They are more economical and less complex than opposed blade dampers and are most common in open/close applications. However, the main difference between the two is in their range of applications. Opposed blade dampers are more appropriate for volume control over a wider range than parallel blade dampers. Further, they are more sensitive to arm swings.

The relative size of the damper and duct can impact flow. If the damper is small, it will restrict flow in an area as large as its opening. Similarly, a small damper in a large wall will result in a low-pressure region downstream of the damper. This can negatively affect pressure controllers. The position of the damper within the duct will also affect noise levels in the occupied space.

Despite its name, there is no single, universal design for this type of control damper. Commercial dampers come in different shapes, including wedge, aero foil, and flat plates with crimped edges. They also have trailing edges that incorporate materials to ensure air tightness when closed. Commercial dampers commonly known as butterfly dampers. They used in small rectangular or circular ducts. Their size and configuration are important considerations for choosing an opposed blade damper.

Inlet vane dampers

Inlet vane dampers designed to control the amount of air entering a centrifugal fan. They supplied with or without a center hub, depending on the process gas chemistry. They are engineered to control the relative position of the fan blades and are available in both nested and self-restraining styles. This article describes the various types of inlet vane dampers. In this article, we’ll explore the types and how to select the right one for your application.

Inlet vane dampers can be single or double-selective. A single vane type has an output signal that represents the maximum position, while a double-sealed design is available for more complex applications. Both types of inlet vane damper work by minimizing the resistance to flow. A single vane design used for air systems that contain corrosive materials and abrasive gases.


Scoop tube actuators used in inlet vane dampers. They have a similar interlocked operation but work more as a secondary component in the control loop. Scoop tube actuators used to modulate inlet vanes within specified maximum and minimum positions. These actuators can be manual or motor-driven. A guide blade shaft is interconnected with a swivel to allow it to be adjusted with precision.

Advantages of Inlet vane dampers

Inlet vane damper have many advantages. Variable inlet vanes impart swirl in the direction of rotation. By closing the vanes, more swirl is created in the air and the pressure is reduced. This results in reduced pressure, but additional friction losses. And variable inlet vane damper can control the speed of the main furnace. And with so many advantages, why choose variable inlet vane dampers over fixed ones?

The type of inlet vane damper you choose will depend on the volume of air in the system, the pressure in the ductwork, and the type of material that will pass through it. A high-quality inlet vane damper is best suited for systems that deal with air quality and gases. There are many types of inlet vane damper available on the market today. Flextech Industries offers a wide variety of inlet vane damper to choose from.

Weighted damper

Weighted dampers are a type of vibration isolation device that uses weights to respond to different vibration frequencies. Each weight has a specific mass that is arranged in an inner cavity to provide optimal center of gravity. As a result, the overall mass of the damper is relatively light compared to a traditional bell-shaped damper. The specification for these dampers covers the use and installation of this type of damper.

The company also pointed to testimony of its chief boiler engineer. It pointed out that compressed-air damper have an automatic failure position if there is a loss of pressure. However, the chief boiler engineer testified that after the explosion, Green Plains installed weights on its damper, which enable its employees to open the damper manually. Weighted damper are also safer than conventional designs. Weighted damper have other benefits.

The weights of a weighted damper enable it to cover a greater frequency range, which translates into better protection. In addition, a weighted damper egg-like shape makes it suitable for use in applications that require extra high voltage. A rounded weight design also allows it to be used in corona discharge control and in EHV environments. This allows for greater energy dissipation.

Type of Weighted Damper

A common type of weighted damper is the Bypass damper. These designed to bypass excess air created by zone damper. Bypass damper made of galvanized ductile iron casting. Weighted damper can also made of any material that meets the required standards. A simple way to fine-tune the operation of a damper is to install a counterbalance weight on it.

Motorized damper are typically hardwired into a control board. To remove the motor, disconnect power from the damper unit. Once you have disconnected the power, remove the damper unit’s motor, and follow the manufacturer’s instructions to replace it. Then, disconnect the dampers unit from the rest of the air duct. It should be relatively easy to replace the motor. However, be sure to follow all manufacturer’s safety procedures and use proper tools.

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