Damper HVAC – A Vital Component in HVAC Systems

Let us first understand what are dampers in HVAC systems. The flow of air inside a duct, chimney, VAV (Variable Air Volume) box, air handler, or other air-handling equipment can be stopped or controlled by a damper, a valve, or a plate. A damper in a chimney flue seals the flue to allow warm or cold air to enter while keeping the weather, birds, and animals out.

It can be used to manage central air conditioning for individual room temperature and climate control or to turn it off for an empty room. Its functioning can be either automatic or manual. The damper may occasionally be partially closed to help regulate the combustion rate.

What is a Damper HVAC?

A moveable plate found in the ductwork known as an HVAC damper, also known as a duct damper, controls airflow and directs it to particular regions of the house. Dampers are frequently employed in “zone control” or zoning systems.

5 Different Types of Dampers in HVAC

Below we have listed five (5) major types of dampers used. These HVAC dampers system has different purposes depending upon their usage at the place.

1. Control Dampers for HVAC

Control dampers control airflow by opening and shutting the blades in the ductwork. This straightforward motion may be used for a variety of things, like mixing hot and cold air streams for air conditioning or directing airflow to a particular area of the structure.

Control Dampers continually open and close all day long. Buildings employ commercial volume control dampers to manage the flow of air via an HVAC system. They can be utilized in applications involving intake, exhaust, or mixed air. Commercial Volume Control Dampers and Balancing Dampers are the two types of control dampers.

2. Balancing Dampers

They are called balancing dampers because we use them to balance the airflow throughout the system. A balancing damper is a straightforward device inside the ductwork that blocks off a certain duct.

The angle of the damper’s blades is modified by specialists, who gauge the air pressure in space as they work. The balancing damper’s blades are locked in place to maintain the required air pressure once the proper air pressure has been determined.

In the future, they can be unlocked for alterations.

3. Isolation Dampers

To effectively shut down and isolate one or more filter stages in a hazardous-duty containment exhaust system, isolation dampers are created. Our top-of-the-line isolation dampers are bubble-tight.

When there is a possibility of contaminated air, isolation dampers are employed in ventilation systems.

4. Multi-zone Dampers

Zone dampers at the air unit of multi-zone systems combine warm air from a heating coil and chilled air from a chilled water coil to control the temperature of an area or a zone.

These dampers are substantial assemblies made up of several dampers, each connected to a particular zone. Multi-zone dampers are duct-connected devices that regulate the airflow throughout the whole system.

Multiple actuators will be used in such dampers, each of which will regulate a different zone. These dampers are frequently sold as a whole set along with the air handling unit.

5. Industrial Dampers

Since they are made to help manage airflow for clean air, airstreams with particles, and airstreams with corrosive gasses, industrial dampers are an essential component of every industrial air system.

To guarantee optimum longevity, every component of such a damper is welded into place. Such air dampers are frequently employed in industries and power plants, sites with significant airflow requirements.

There are many HVAC damper manufacturers like EBAirControl.com that you can find easily, but only a few trustable ones. All it demands is thorough research for whichever supplier or manufacturer you are willing to deal with. Google reviews, feedback, and the company’s reputation could be some of the ways to identify them.

Where are HVAC dampers located?

The most typical place for HVAC dampers is in the main trunk line, before and after any significant intersections. Additionally, they can be found at certain locations on various system ducts, with two dampers on each main line spaced 90 degrees apart.

In a house, HVAC dampers are typically found in the main supply trunks. The ductwork’s supply trunks are the sections that, depending on the season, blow either warm or cold air. Usually, they are installed on each air duct run away from the air handler and a few feet from the base of the unit.


The need and importance of damper HVAC cannot be ignored. It is required in houses as well as in industries to regulate the air.