As an Amazon Associate I earn from qualifying purchases.
004 to 008 in. Minimal pressure to open. Available in 4", 7", 5", 6", 12", 10", 8", 14" and 16". W. G. Spring-loaded butterfly aluminum damper blades encased in a 20-guage galvanized steel housing.




Back draft damper for insertion into 4 inch ventilation ducts. In this case, the flap is installed in such a way that the flap leaves only open into the outgoing air direction. The rubber seal prevents loud rattling when the flap blades open and close. This also applies to the vertical installation.
This means that no cold air / wind can penetrate the ventilation pipe from the outside. The backflow damper RKI opens and closes automatically. The housing of the flap is made of galvanized steel, the flap blades are made of aluminum, the axle and spring are made of stainless steel. Designed for use in ac, vents and other residential, exhaust, heating systems, dryers, extractor or range hoods, commercial and industrial HVAC applications. Functionality: duct draft stopper prevent cold air or wind from entering the ventilation pipe.

The housing of the flap is made of galvanized steel, the flap blades are made of aluminum, the axle and spring are made of stainless steel. The backflow damper opens and closes automatically. It has a strong spring and can be installed either horizontally or vertically.
The backflow preventer valve is installed by pushing it into the ventilation pipe as far as it will go. This means that no cold air / wind or smell can penetrate the ventilation pipe from the outside. Duct draft stopper prevent cold air or wind from entering the ventilation pipe. Designed for use in ac, heating systems, exhaust, vents and other residential, extractor or range hoods, dryer vent, fans, commercial and industrial HVAC applications. The flap is suitable for retrofitting, since it is completely inside the duct.


1. ALDES
#ad
ALDES 5 Inch 5" Round Spring Loaded Backdraft Damper, Professional Grade
#adALDES #ad - Highest rated premium airflow Control Backdraft Dampers - Used Specifically for 5" Duct Size Applications. Maximum automatic back flow protection.004 to 008 in. Minimal pressure to open. Available in 4", 7", 5", 6", 12", 10", 8", 14" and 16". W. G. Spring-loaded butterfly aluminum damper blades encased in a 20-guage galvanized steel housing.
More information #ad
Extremely easy and secure inline duct insertion installation. May be installed in any position or orientation to prevent backflow and designed for use in AC, Heating, Vent and other HVAC application temperatures from -22 to 180 degrees F Fahrenheit.Brand | ALDES #ad |
Manufacturer | American Aldes #ad |
Height | 4.75 Inches |
Length | 2 Inches |
Weight | 0.31 Pounds |
Width | 4.75 Inches |
Part Number | 99 024 |
More information #ad
2. HVAC Express
#ad
Butterfly Backdraft Damper 7 Inch BD 7
#adHVAC Express #ad - Proven design to protect against backdraft in your appliance venting. Vertical or horizontal mounting, with one end crimped. Made in the USA. Heavy-duty 26 gauge galvanized metal. Backdraft damper with lightweight blades and foam closure shutter for quiet closure.More information #ad
Brand | HVAC Express #ad |
Manufacturer | HVAC Express #ad |
Height | 7 Inches |
Length | 7 Inches |
Weight | 1 Pounds |
Width | 7 Inches |
Part Number | BD 7 |
More information #ad
3. AC Infinity
#ad
AC Infinity 6" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 6” Ducting in Range Hoods and Bathrooms Fans
#adAC Infinity #ad - Galvanized steel body with spring-loaded aluminum damper blades that open with minimal airflow. Duct openings | product Length: 5. 03 inches | Finish: Powder Coat. An antidraft duct insert designed for use with range hoods, bathroom fans and other home HVAC applications.More information #ad
Features outer rubber gaskets that create an airtight seal and grip between the damper and ducts. Mounts horizontally or vertically to prevent backflow and debris from entering ducting. Fit for 6 in.Brand | AC Infinity #ad |
Manufacturer | AC Infinity #ad |
Part Number | AC-BDD6-B |
Model | AC-BDD6-B |
More information #ad
4. ALDES
#ad
BDD4, Aldes 4" Backdraft Damper
#adALDES #ad - Inserts into pipe to create a tight seal. Back draft damper measures 4 inches. Tight fit spring closure.More information #ad
Brand | ALDES #ad |
Manufacturer | American Aldes Ventilation Corporation #ad |
Height | 3.75 Inches |
Length | 1.75 Inches |
Weight | 0.19 Pounds |
Width | 3.75 Inches |
Part Number | 99 023 |
More information #ad
5. Klimapartner
#ad
RKI 4", Professional Backdraft Damper Inline Spring Loaded for Dryer Duct
#adKlimapartner #ad - The flap is suitable for retrofitting, since it is completely inside the duct. A tight sealing and fastening of the duct is achieved by the rubber strip attached to the outside of the draft blocker damper. It has a strong spring and can be installed either horizontally or vertically.Back draft damper for insertion into 4 inch ventilation ducts. In this case, the flap is installed in such a way that the flap leaves only open into the outgoing air direction. The rubber seal prevents loud rattling when the flap blades open and close. This also applies to the vertical installation.
More information #ad
Installation: the backflow preventer valve is installed by pushing it into the ventilation pipe as far as it will go. The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally. This means that no cold air / wind can penetrate the ventilation pipe from the outside. The backflow damper RKI opens and closes automatically. The housing of the flap is made of galvanized steel, the flap blades are made of aluminum, the axle and spring are made of stainless steel. Designed for use in ac, vents and other residential, exhaust, heating systems, dryers, extractor or range hoods, commercial and industrial HVAC applications. Functionality: duct draft stopper prevent cold air or wind from entering the ventilation pipe.
Brand | Klimapartner #ad |
Manufacturer | klimapartner #ad |
Height | 3.94 Inches |
Length | 2.05 Inches |
Weight | 0.22 Pounds |
Width | 3.94 Inches |
Part Number | 4054503017276 |
More information #ad
6. Vent Systems
#ad
Vent Systems 6'' Inch Backdraft Damper, Heavy-Duty Inline Springs Loaded, Inline Fan Vent Deflector, Backflow Shutter, One-Way Airflow Ducting Insert
#adVent Systems #ad - The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally. Back draft damper for insertion into 6 inch ventilation ducts. This also applies to the vertical installation. Best to use with vent sYSTEMS HVAC parts.The housing of the flap is made of galvanized steel, the flap blades are made of aluminum, the axle and spring are made of stainless steel. The backflow damper opens and closes automatically. It has a strong spring and can be installed either horizontally or vertically.
More information #ad
A tight sealing and fastening of the duct is achieved by the rubber strip attached to the inside of the draft blocker damper. In this case, the flap is installed in such a way that the flap leaves only open into the outgoing air direction. The backflow preventer valve is installed by pushing it into the ventilation pipe as far as it will go. This means that no cold air / wind or smell can penetrate the ventilation pipe from the outside. Duct draft stopper prevent cold air or wind from entering the ventilation pipe. Designed for use in ac, heating systems, exhaust, vents and other residential, extractor or range hoods, dryer vent, fans, commercial and industrial HVAC applications. The flap is suitable for retrofitting, since it is completely inside the duct.
Brand | Vent Systems #ad |
Manufacturer | Vent Systems #ad |
Weight | 240 Grams |
More information #ad
7. Broan
#ad
Broan BP87 Vertical Discharge Damper, 7-Inch
#adBroan #ad - 7-inch vertical discharge damper. Helps keep your range hood operating at peak performance. Made from the highest quality materials. Sturdy to use.More information #ad
Brand | Broan #ad |
Manufacturer | Broan-NuTone #ad |
Height | 0.53 Inches |
Length | 0.83 Inches |
Weight | 0.3 Pounds |
Width | 0.72 Inches |
Part Number | BP87 |
Model | BP87 |
More information #ad
8. AC Infinity
#ad
AC Infinity 8” Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 8” Ducting in Range Hoods and Bathrooms Fans
#adAC Infinity #ad - Mounts horizontally or vertically to prevent backflow and debris from entering ducting. Duct openings | product Length: 5. 03 inches | Finish: Powder Coat. Galvanized steel body with spring-loaded aluminum damper blades that open with minimal airflow.More information #ad
Features outer rubber gaskets that create an airtight seal and grip between the damper and ducts. Fit for 8 in. An antidraft duct insert designed for use with range hoods, bathroom fans and other home HVAC applications.Brand | AC Infinity #ad |
Manufacturer | AC Infinity #ad |
Part Number | AC-BDD8-B |
Model | AC-BDD8-B |
More information #ad
30-90% Disocunts Found!
We found that some of the products on this list are now discounted on Amazon! Do you want to see these products?
Disclaimer: We earn small fee from purchases made on Amazon.