









🌪️ Stop drafts in their tracks—upgrade your airflow game with Repa Market!
The Repa Market Galvanized Steel 4 Inch Duct Backdraft Damper is a robust HVAC accessory designed to fit standard 4-inch ducting. Made from galvanized steel and aluminum with noise-reducing foam seals, it features dual spring-loaded flaps that allow airflow in one direction only, preventing backdrafts, cold air, and odors. Easy to install without tools, it’s ideal for dryer vents, kitchen exhausts, and various ventilation systems, ensuring efficient, quiet, and durable performance in both residential and commercial settings.






| ASIN | B0822VQMHM |
| Best Sellers Rank | #265,392 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #584 in HVAC Ducting |
| Brand Name | Repa Market |
| Color | Silver |
| Customer Reviews | 4.4 4.4 out of 5 stars (998) |
| Global Trade Identification Number | 07427046530293 |
| Included Components | Backdraft Damper |
| Item Dimensions L x W x Thickness | 4"L x 3.46"W x 4"Th |
| Manufacturer | Repa Market |
| Material Type | Galvanized Steel |
| Unit Count | 1 Count |
J**.
Worked good for our hood fan
Hooked up inline with our hood fan above our stove, prevented back draft of cold air in the winter season. Easy install
P**M
Thank you!
Living in the deep south, after installing a new kitchen exhaust fan the down-draft from the attic was overwhelming. Especially since kitchen exhaust fans are located right over the stove and it is canning season! This item is wonderful. There is no more down-draft at all and combined with my wonderful new exhaust fan my kitchen is comfortable again. At least as comfortable as it can be when I am canning in the summer time in the deep south ;) Great product, shipping time was fast, installation was easy. Thank you!
J**H
Works but spring is weak
This damper works, but the spring is very weak. If you tip it anywhere past horizontal the doors fall open, so it can only be installed with the doors facing up or horizontally. Additionally if the doors open all the way to the center, the springs are not strong enough to push them closed again. I haven't run into an issue with this yet, but just noticed during the installation and will need to check at some point to make sure they are not stuck open.
J**S
Does what they say they’ll do
Perfect, really does what it is meant to do. I have two bathrooms that I connected to the same exit vent with a y connection, and noticed that when one bathroom vent was on, the other would get some of the air going out. I put these in and neither bathroom gets the back flow any more.
A**Y
Better than expected
Well made and blocker plates (2 half moon pieces) pivot well for exhaust under lower pressures, and allows very minimal backdraft air to enter.
D**N
Its just fine after proper assembly.
This thing was not functional out of the bag. It looked used. The springs were on backwards so the flaps would not stay closed. This 5 inch damper has 2 springs and when in the correct way are a bit stiff. It does work but it wasn't plug and play.
A**R
Good buy
Worked great. As described.
R**C
Keeps unwanted air out!
Had an issue with hot are back drafting through my bathroom exhaust vents during the summer time and cold air coming through in the winter time! These stopped that issue. Seal in the inside ensures unwanted air stays out of areas you don’t want it
B**N
Perfect draft stopper. No more air blowing back inside my dryer so that means my house is now warmer
A**H
Unseviceable.
M**L
B**Y
Perfetta, ha risolto il problema di afflusso di odori sgradevoli dall'esterno, ottima valvola di non ritorno. Grazie
F**N
alles ok
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