Backdraft dampers allow efficient airflow through ducts, preventing unwanted air influx while optimizing efficiency. These dampers overcome the limitations of traditional volume control or butterfly types. Preventing unwanted airflow helps improve indoor air quality and maintain temperature consistency.

The types of dampers in HVAC residential systems, including backdraft dampers, promote consistent temperatures, reducing strain on heating and cooling systems.

Industrially, backdraft dampers prevent system backflow of harmful fumes or chemicals, lowering the re-entry of dangerous exhaust. Read on to understand more about backdraft dampers and how to use them in both residential and commercial settings.


Backdraft Damper Components

Backdraft dampers have several crucial components, including seals between the damper and frames that allow independent blade movement. Installed at the hinge mechanism, these seals enhance the damper’s stability.

The most important components are the blades, which pivot to permit outward airflow while blocking the intake. Backdraft dampers use either single or multiple blades. The frames, which are made from galvanized steel or aluminum, house the blades, seals, and linkages.


Backdraft Damper Types

These are some of the different types of backdraft dampers and their specifications:

  • Aluminum increases durability
  • Resistant to corrosion for longevity
  • Regulate exhaust system airflow
  • Angled hood for improved efficiency
  • Integrated insect screens block pests
  • Multiple size options
  • Withstands high temperatures
  • Best for heat exhaust systems lacking powered dampers
  • Foam seals minimize leakage
  • Reduces energy loss from conditioned spaces
  • Comes in various sizes
  • Features sturdy, heavy-duty galvanized steel
  • Regulates exhaust system airflow
  • Interchangeable backdraft damper design
  • Maintains airflow via angled design
  • Insect screens in each duct

Residential Backdraft Dampers

Residential backdraft dampers are ideal for regulating airflow and ventilation in common household ductwork and vents. From exhaust fans to laundry dryer ducts, the dampers promote efficiency, temperature consistency, and indoor air quality throughout the home.

For preventing pollutant infiltration, proper airflow and choosing a quality air filter are critical if you suffer from household allergy/asthma. Backdraft dampers also conserve energy by regulating airflow. During storms, the dampers block moisture, debris, and cold air intrusion into your home. 

Effective ventilation ensures a comfortable, healthy home environment. Backdraft dampers vent household pollutants outside rather than recirculating them indoors.

Today’s Homeowner Tips

You can install backdraft dampers in any ducts or openings across your building with full confidence that they’ll work without noise or loud vibrations.


Commercial Backdraft Dampers

Industrial backdraft dampers function as either gravity or control dampers based on the application. As gravity dampers, backdraft dampers allow one-directional airflow to prevent backflow. In systems like wind turbines, the dampers close to halt reverse spins during high winds.

Likewise, motorized backdraft dampers with counterweights and powered blades precisely regulate pressure differentials for industrial HVAC and pollution control.

Some examples of industrial backdraft dampers include: 

Fan Accessory Industrial Backdraft Damper

I recommend these for low temperatures and clean air applications like blower outlets for automatic isolation. The assisting springs and counterbalancing weights reduce the load on bearings and linkages. 

Relief Damper

This damper is best for maintaining a constant airflow at various air pressures. It automatically closes when there is a change in the differential pressure, such as built-up pressure in duct systems.

Barometric Relief Damper

I suggest using this one for gravity ventilation and low-velocity systems, like stairwell and room pressurization.


Is a Backdraft Damper Right for My Home?

Any household can benefit from a backdraft damper’s airflow control and efficiency. Dampers are vital for homes vulnerable to allergens or pollution. Properly installed, size-appropriate dampers can help protect your indoor air and reduce energy costs for years to come.


Backdraft Damper FAQs

Where should I install a backdraft damper?

Install a backdraft damper near vent exits in your bath and kitchen fans, dryer vents, attic fans, and window fans to maximize efficacy.


What maintenance do backdraft dampers need?

You should check your dampers annually to ensure proper operation. When checking, clean debris, ensure blades fully close, replace damaged screens, and lubricate noisy pivots.


Can I self-install a backdraft damper?

DIY installation works for dampers under 16 inches. However, for dampers over 16 inches, HVAC technicians have the proper tools and training for secure mounting. I suggest hiring a professional when it comes to installing large dampers.


Editorial Contributors
avatar for Mitchell Layton

Mitchell Layton

Mitchell Layton is a former professional mover who currently lives in Philadelphia, Pennsylvania. Mitchell spent years packing and moving for REAL Rock N Roll Movers, a commercial and residential moving company based in Los Angeles that’s primarily staffed with up-and-coming musicians. That gave him plenty of experience navigating box trucks up and down the winding streets of LA. In addition to moving hundreds of happy customers into new homes and apartments all across Southern California, Mitchell has also performed corporate moves on company lots for Nickelodeon, Warner Bros, Universal Studios, Paramount, and more. After pouring blood, sweat, and tears into his profession, Mitchell has all the helpful tips you need for your next move.

Learn More

photo of Lori Zaino

Lori Zaino

Lori Zaino is a freelance writer and editor based in Madrid, Spain. With nearly two decades of editorial experience, she’s written and edited for publications like Forbes, CNN, Insider, NBC, Newsweek, The Points Guy, The Infatuation, and many others. Having just completed her first home renovation, she’s more interested in home improvements than ever, dedicated to bringing you fresh and accurate content to help you update your living spaces.

Learn More