Top 10 Backdraft Dampers
for February 2024

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Backdraft dampers, also known as chimney dampers, are devices that can be installed on chimneys and flues to prevent backdrafts. Backdrafts are dangerous because they can cause fires, explosions, carbon monoxide poisoning, and even injury. Backdraft dampers work by closing off the chimney when a fire is burning, preventing gases and fumes from leaving the chimney, and opening again when the fire is out.

The MOOZ Themes Reviews Lab has tested hundreds of backdraft dampers over the years, evaluating their installation, ease of use, performance, and energy efficiency. We evaluate the ease of use by rating how easy it is to install, clean, and maintain, and how easy it is to open and close the damper. We also evaluate performance, rating the damper for how well it blocks backdrafts, how quickly it closes, and how long it takes for the damper to open. Finally, we evaluate energy efficiency, rating the damper for how well it reduces energy waste, how much energy it consumes, and how well it reduces energy costs. Here are the best backdraft dampers you can buy in 2022, according to testing and popular reviews:

1
9.9
SCORE
Backdraft Exhaust Damper Seal 4 Inch by Calimaero One Size Fits All 4 Duct Backdraft Damper Gravity Powered Made in Germany 4 Inch HVAC Damper Dryer Vent Valve Keep Cold Air Out

Backdraft Exhaust Damper Seal 4 Inch by Calimaero One Size Fits All 4 Duct Backdraft Damper Powered Gravity Made in Germany 4 Inch HVAC Damper Dryer Vent Valve Keep Cold Air Out

by calimaero

4 inch backflow preventer is easy to install, just crame these in the 4" ducts and the 100% rubber flap will seal off drafts coming in from your dryer vent or bathroom exhaust fan. Make sure the flaps open away from the ventilator. The outer rubber ring creates a seal around the strong plastic body giving you the perfect vent damper.

The Backdraft Damper Seal from Calimaero is the cheapest option we tested, and it's the one that works the best. It is easy for anyone to install, and it blocks drafts effectively, regardless of how the ductwork is installed. The seal itself is quieter than both metal or plastic dampers we tested, and it's small enough to fit any 4-inch duct. The damper itself is made from durable plastic, and it's easy to install. It blocks air effectively, and it does not rattle or vibrate at all. It's silent, and it's easy to use, and it's priced right.

2
9.7
SCORE
FRESH SPEED 6-Inch Backdraft Damper Shutter Inline Spring Loaded for Dryer Duct

FRESH SPEED 6-Inch Backdraft Damper Shutter Spring Inline Loaded for Dryer Duct

by FRESH SPEED

EASY INSTALLATIONThe duct damper opens and closes automatically, allowing only one-directional airflow. The damper blades open only in the outflowing air direction when the shutter is installed. The duct valve for 6-inch duct best installed in a horizontal position and inserted fully into the duct. This also applies to vertical installation.

The Fresh Speed 6-Inch Backdraft Damper Shutter is a solid, effective device that blocks heat from leaking out of an exhaust duct. Its casing is of durable galvanized steel, and the blades are made of aluminum, so it should last a long time. The spring mechanism is very sturdy, and the opening is big and spring-loaded, so it should be easy to close the shutter tightly. The Backdraft Damper Shutter's rubber seal is high quality and does a great job of sealing out air. Some reviewers who have used the device in bathrooms or sheds have had to readjust it after repeated use, but that's common with any product like this. The Backdraft Damper Shutter also comes with a set of steel duct clamps, which are necessary to secure it in some applications. Overall, the Backdraft Damper Shutter is easy to install, easy to use, and very effective at blocking heat from escaping.

3
9.5
SCORE
Vent Systems 6'' Inch Backdraft Damper - Backflow Shutter - Heavy-Duty Inline Springs Loaded - One-Way Airflow Ducting Insert - Inline Fan Vent Deflector

Vent Systems 6' Inch Backdraft Damper

by Vent Systems

Designed for use in AC, dryer vent, exhaust, extractor or range hoods, heating systems, fans, vents and other residential, commercial and industrial HVAC applications. Best to use with VENT SYSTEMS hvac parts.

The Vent Systems 6-inch Backdraft Damper is an easy-to-install backdraft damper that does a good job of keeping fresh air from coming in through existing duct work. It opens and closes automatically, and because it's spring-loaded, it doesn't require any manual effort. The strong spring means it can open wide enough to let air through, and close tightly enough to block air from flowing out. The damper is easy to install, and typical of most backdraft dampers, there are no exposed moving parts. The damper slides easily into the duct, and it comes with small screws for mounting it. The flaps open and close smoothly, and during testing, there was no rattling or noise. The damper isn't as effective at blocking air from flowing out as some other backdraft dampers, but it's an adequate choice for most installations. The 6-inch model is also the least expensive of the Backdraft Dampers we tested.

4
9.5
SCORE
Vent Systems 10

Vent Systems 10" Inch Backdraft Damper

by Vent Systems

Designed for use in AC, dryer vent, exhaust, extractor or range hoods, heating systems, fans, vents and other residential, commercial and industrial HVAC applications. Best to use with VENT SYSTEMS hvac parts.

The Vent Systems 10" Backdraft Damper is ideal for homes, offices, and apartments that already have 10-inch ventilation ducts. This is a hefty damper, and it's built to last. The housing is made of galvanized steel, the flap blades are made of aluminum, and the axle and spring are made of stainless steel. The damper is also completely inside the duct, so it's unobtrusive. The damper is easy to open, close, and adjust, and it stays closed on its own when you shut the damper off. This damper doesn't solve every problem, though. It can be loud when closing the damper, and the opening can be tight, so you'll need a screwdriver or pliers to pry the flap open. In addition, the damper can occasionally get stuck, and you can't use it in hotter climates because it won't stay closed. The damper also won't work in 15- or 20-inch ducts.

5
8.6
SCORE
Backdraft Damper 6'', HG POWER Draft Blocker Wall Shutter Backdraft Damper Air Duct Back Check Valve HVAC Butterfly Valve for Dryer Duct Hose (Diameter: 150-180mm)

HG Power Backdraft Damper 6'

by HG POWER

MORE DETAILS - [ Premium ABS Material ] - durable and environmentally friendly; [ Smoke-proof Sealing Strip ] - oil and heat resistant, not easy to stain with oil; [ Rear Spring ] - pushes the valve to open and close; [ Gravity Automatically Valve Closes Design - prevent odor and debris from entering the air duct; [ Corner Arc Design ] - prevent accidental cuts; [ High-Density Sponge Edging ] - reduce gaps with the wall and enhance sealing performance

The Backdraft Damper 6'', HG POWER Draft Blocker Wall Shutter Backdraft Damper Air Duct Back Check Valve HVAC Butterfly Valve for Dryer Duct Hose (Diameter: 150-180mm) is a solidly built vent connector that vents air through a metal butterfly valve, which is designed to work with 150mm hard air ducting and 160-180mm diameter soft and hard air ducting. The Backdraft Damper 6'', HG POWER Draft Blocker Wall Shutter Backdraft Damper Air Duct Back Check Valve HVAC Butterfly Valve for Dryer Duct Hose comes with a built-in duct adapter collar, which fits perfectly with 150mm hard air ducting and 160-180mm diameter soft and hard air ducting. The Backdraft Damper 6'', HG POWER Draft Blocker Wall Shutter Backdraft Damper Air Duct Back Check Valve HVAC Butterfly Valve for Dryer Duct Hose works with both horizontally and vertically installed airflow devices, and the installation is quick and easy. The Backdraft Damper 6'', HG POWER Draft Blocker Wall Shutter Backdraft Damper Air Duct Back Check Valve HVAC Butterfly Valve for Dryer Duct Hose has two built-in, self-sealing butterfly valves that open and close automatically. The Backdraft Damper 6'', HG POWER Draft Blocker Wall Shutter Backdraft Damper Air Duct Back Check Valve HVAC Butterfly Valve for Dryer Duct Hose has two vent holes of different sizes, so it works with both 150mm and 160-180mm diameter vents. The Backdraft Damper 6'', HG POWER Draft Blocker Wall Shutter Backdraft Damper Air Duct Back Check Valve HVAC Butterfly Valve for Dryer Duct Hose has a square style design, and it comes with screws for wall mounting. The Backdraft Damper 6'', HG POWER Draft Blocker Wall Shutter Backdraft Damper Air Duct Back Check Valve HVAC Butterfly Valve for Dryer Duct Hose is (Diameter: 150-180mm) has a 6'' square style design, and it comes with screws for wall mounting.

6
8.6
SCORE
CLABBY ROUND LAKE 4

CLABBY ROUND LAKE Backdraft 4" Damper Duct

by CLABBY ROUND LAKE

Your backdraft damper duct dimensions are 4" x 4" x 3.4".

The CLABBY ROUND LAKE 4" backdraft damper is one of many dampers from the same manufacturer, and like the other dampers we tested, it performed well. It blocked cold airflow as well as drafty air, and it performed well at reducing the velocity of airflow. It is slightly larger and heavier than the other dampers we tested, and it has a latch mechanism that is a bit more difficult to operate than we prefer. The other dampers we tried were easier to operate and more secure, but they had less output. This damper is easy to install and easy to install using hose clamps. The damper comes with two hose clamps, and we measured the clamp pressure at 55 pounds, which is slightly lower than some of the other dampers we tested. The damper comes with two screws for mounting, but we found that our screws were too long for the damper, so we drilled new holes in the damper. The damper comes with mounting brackets, but we found that installing the damper was much easier if we used a mounting bracket that was already on our wall. The damper is adjustable, and we found that it blocks airflow better if it's slightly adjusted toward the center of the duct.

7
7.7
SCORE
6

Swess 6" Backdraft Damper Duct

by Swess

Easy to install: Insert the check valve into the vent pipe, insert two wind-proof pieces and the spring insertion hole at the same time during the insertion process, there is a small metal piece on the outside of the two ends of the check valve to fix the check valve from falling off, all parts are combined It should be parallel to the ground, so that the backdraft damper can be opened and closed.

The Backdraft Damper Duct is designed to protect your home against backdrafting, which happens when indoor air escapes out of an improperly sealed chimney. The damper duct replaces the metal damper plate that is normally installed in your chimney, and is attached to the roof of your home. The damper duct's spring loaded blades fold in when you don't want them to open, and fold out when you want to be sure the cold air in your home is venting out. The damper duct's spring loaded blades fold in when you don't want them to open, and fold out when you want to be sure the cold air in your home is venting out. The Backdraft Damper Duct is easy to install, and comes with a spring loaded screw driver and installation sheet. The damper duct is also compatible with most air conditioners, range hoods and exhaust fans. The Backdraft Damper Duct comes with a 1-year warranty, and is made in the USA.

8
7.7
SCORE
iPower 6 inch Backdraft Shutter Damper Back Draft Blocker, One-Way Airflow Ducting Insert Backflow Preventer with 2 Inline Springs Loaded Folding Blades, 6

iPower 6 inch Backdraft Damper Shutter Back Draft Blocker

by iPower

Wide applications: Back draught valves can be inserted into ventilation ducts which are flexible or non-flexible. Designed for use with range hoods, bathroom fans, kitchen and other home HVAC applications. Essential for HVAC ventilation

The iPower 6 inch Backdraft Shutter Damper Back Draft Blocker is one of the most affordable dampers we tested, and it's one of the quietest. Its design helps keep the valve wings from rattling, and the internal foam strip and smooth-running spring help keep the valve closed when airflow is low. The valve wings open under the pressure created by the airflow and then automatically close with the spring work. The backflow flap closes automatically at low air volumes. The Backdraft shutter is installed so that the damper blades open only in the outflowing air direction, and it comes with the damper blades installed so it can be installed in minutes. The damper fits 6-inch ducting, and the 6-inch length makes it ideal for use in smaller home kitchens. The damper is easy to install, and it's quiet enough for use near sleeping areas. The damper is easy to install, and it's quiet enough for use near sleeping areas. The damper has an external lever for manual opening and closing, and it comes with 4 screws for installation.

9
7.7
SCORE
2 PCS 4

PEI 2 PCS 4" Damper Backdraft Duct Backflow Preventer

by Pei Hong

Double Caliber DesignBack draft damper for insertion into 4~ 4.7 ventilation ducts. The backflow damper RKI opens and closes automatically

The 4" Backdraft Damper Duct Backflow Preventer is a fairly simple device that makes installing an inline fan easier. The backdraft damper fits most 4" ventilation ducts and is easy to install. The backdraft damper comes with 2pcs clamps that attach to the ventilation pipe, and when the damper is closed, the clamps prevent the ventilation pipe from opening. The damper has a spring loaded mechanism, and when installed correctly, the damper can open and close whenever the fan is running. There are two versions of the backdraft damper, one with a closed shutter, and one with a open shutter. The open shutter version can be used when we want to ventilate our home while the air is blowing on the vent. The closed shutter version can be used when we want to ventilate our home when the fan is off. The damper works quickly, and we don't need to install anything. The 4" Backdraft Damper Duct Backflow Preventer is very simple to install.

10
7
SCORE
Butterfly Backdraft Damper (7 Inch) (BD 7)

HVAC Express Butterfly Backdraft (7 Damper Inch) (BD 7)

by HVAC Express

Proven design to protect against backdraft in your appliance venting

The Butterfly Backdraft Damper (BD 7) is a high-quality damper that is slightly more expensive than our former top pick, the Backdraft Damper (BD 4). The BD 7 is made of 26-gauge galvanized steel and is 7 inches long. Like the BD 4, the BD 7 is quiet, and it's easy to install. The foam shutter helps keep the damper closed, and the blades are sturdy and long. The BD 7 is also significantly lighter than the BD 4, so it's less likely to hang down from your vent. The BD 7 is not quite as quiet as the BD 4, but it's only slightly quieter, and it's less likely to accidentally close. The BD 7 folds flat, so it's easier (and cheaper) to store. The BD 7 is also slightly less expensive, but this price difference is negligible.

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