Where are dampers in ductwork?

Asked By: Marietta Hederich | Last Updated: 19th May, 2020
Category: home and garden indoor environmental quality
4.7/5 (435 Views . 28 Votes)
An HVAC damper (also called a duct damper) is a movable plate, located in the ductwork, that regulates airflow and redirects it to specific areas of the home. Dampers are typically used in zoning or “zone control” systems.

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Keeping this in view, how do you find dampers in ductwork?

  1. Turn the lever on all the registers inside the house to the full open position.
  2. Open the door or access panel to the attic and examine how much lighting is available.
  3. Go into the attic and follow a duct from the furnace to find the damper inside of the ductwork.
  4. Turn each damper to the full open position.

Secondly, where are fire dampers located? Location: Fire dampers are installed in or near the wall or floor, at the point of duct penetration, to retain the integrity and fire rating of a wall or floor whether it is a ducted or open-ple- num return application.

Also to know, where are dampers located?

Go into your basement or attic and find the dampers. Usually, they are positioned somewhere in the “take-offs” or “branches” of the duct system. With manual-type dampers, they have either a rod that you can adjust using a screwdriver or a lever that you can turn by hand.

Is it OK to close HVAC dampers?

Whether closing supply air dampers will cause a problem; if there's not too much static pressure in the system, closing off supply dampers might actually be ok! The only way to know is to measure static pressure and make sure it aligns with HVAC system manufacturer specifications, even when the dampers are closed.

37 Related Question Answers Found

Where are my HVAC dampers?

Dampers are almost always within 2-6 feet of the main trunk. You may only have different style handles, the dampers might be located right off the main trunk or a few feet away, or they might even be rectangular, but you should see something like the image above, cobwebs and all.

How do I adjust my HVAC dampers?

Adjust each air conditioning damper so it provides the right amount of air to each room. Open the dampers in ducts that lead to rooms that are too warm. Close dampers a bit to rooms that are too cool. Make small adjustments; don't open or close any damper completely.

How many types of dampers are there in HVAC?

Even though they are similar in design, there are several different types of dampers and type of damper will perform a specific task. The following are five types of dampers commonly found in HVAC system.

How do you install dampers in existing ductwork?

Open up the duct work, and drill two holes on opposite edges of the tube. These holes should line up with the pre-drilled holes on the damper. Remove the fasteners from the damper, connect it to the duct through these holes and into the drilled holes, and tighten. Then, seal both sides with duct tape.

Does closing vents help AC?


Closing the vents doesn't do it any favors. In fact, instead of helping the air conditioner cool less, closed registers force the same amount of air through other ducts. This builds pressure in the system and makes your HVAC system work harder to distribute the air where you need it.

Do all HVAC have dampers?

HVAC systems contain a furnace, a thermostat, refrigerant lines, an evaporator coil, automated zone dampers, and the actuators that control the dampers. The system also contains a condensing unit along with multiple room vents. Each room has at least one vent that allows warm or cool air to flow in.

Does all ductwork have dampers?

Closed Zone Dampers
HVAC systems utilize dampers in the ductwork to control the way air flows in your home. You should be able to access and adjust them manually. If all of them are open and you're still not feeling any air coming through, you may have another obstruction farther in the duct.

How do HVAC dampers work?

HVAC dampers work by being situated closer to the mouth of the distribution pipe and will push or hold air from that point as needed. The pressure in the pipe will then redistribute the airflow to whatever zone requires regulating at that time.

How does a damper work?

A damper is a valve or plate that stops or regulates the flow of air inside a duct, chimney, VAV box, air handler, or other air-handling equipment. In a chimney flue, a damper closes off the flue to keep the weather (and birds and other animals) out and warm or cool air in.

Should you close AC vents in winter?


When vents are closed, that pressure builds up, potentially causing damage to the HVAC system. Increased air pressure can create cracks and holes in the ductwork. It can also cause your furnace's heat exchanger to crack. Leave all air vents open to prevent extensive damage to your home's heating system this winter.

How do you know if vent is open?

How to identify typical air return vents:
  1. Typically the larger vents in your home.
  2. The vents do not have louvers or slats behind the "grill"
  3. There is a filter connected to this vent.
  4. Turn the system fan on; if you hold a piece of paper up, the paper should be pulled towards the vent due to the air entering the vent.

Should damper be open or closed in summer?

In the summer, a closed damper helps to keep cool, air-conditioned air inside the home where it belongs. 2. In the winter, when you're not using the fireplace, a closed damper helps to keep cold air from swirling down into the house.

What are dampers in HVAC?

HVAC Damper. An HVAC damper (also called a duct damper) is a movable plate, located in the ductwork, that regulates airflow and redirects it to specific areas of the home. Dampers are typically used in zoning or “zone control” systems.

Do return ducts need dampers?

As long as you are talking about return ducts (not supply ducts) it can only improve your system. You will have to adjust dampers for the different seasons. Try and get the dampers in the return grills otherwise you will have to put dampers in the return ductwork.

Should air vents in basement be open or closed?


Whether your vent is open or not, the warm air is still going to try to push through to each vent. When the vents are closed the air won't be able to come easily through the vent. Instead, it will be forced through any crack it can find in the duct work or other areas that aren't sealed properly.

How do you balance a home HVAC system?

Here's how to balance your central heating system:
  1. Start at the furnace unit and follow the main ducts outward, looking for small levers on the side; these are the handles for dampers.
  2. Place thermometers in the rooms in question, away from registers and cold-air returns, and all at about the same height from the floor.

Why is one room in the house so hot?

Dirty air filter—A dirty filter restricts airflow, not letting your home get enough cool air. Closed vents—Closed vents in rooms can cause them to be hotter than other rooms. Open windows—Your conditioned air can flow out of open windows, leaving uneven temperatures in your home.