








💨 Seal the breeze, own your airflow—never let unwanted drafts crash your space!
The Repa Market 4" Duct Backdraft Blocker is a precision-engineered pipe connector featuring a 3.89 inch insertion diameter and a balanced damper to prevent backflow of air, odors, and noise. Designed for easy DIY installation, it fits seamlessly into residential and commercial ventilation systems including dryers, HVAC, and inline extractors. Its durable male spigot and plastic housing ensure long-lasting performance, making it an essential upgrade for efficient, draft-free airflow control.







| ASIN | B084BP47PT |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 25,694 in DIY & Tools ( See Top 100 in DIY & Tools ) 68 in Ducting |
| Colour | White |
| Customer Reviews | 4.2 4.2 out of 5 stars (363) |
| Date First Available | 30 Jan. 2020 |
| Included Components | Male Fit Connector with Suhutter |
| Item Package Quantity | 1 |
| Item Weight | 50 g |
| Manufacturer | Repa Market |
| Material | Plastic |
| Number of Pieces | 1 |
| Product Dimensions | 10 x 10 x 6.2 cm; 50 g |
| Shape | Circular |
| Size | 100mm |
| Special Features | Easy to Install |
| Usage | Commercial/Residential |
M**N
Stops the cold breeze
Simple idea but works very well. Stops the breeze comming through the ducting even on the windy days we've had
A**R
Just what I needed
Mice simple device, installed and doing the job, star lost due to slower delivery time than promised...
A**R
Good quality
Excellent quality fast delivery
T**S
Install it correctly
Works great opens with extractor and closes when extractor is off and stops draft from coming in from outside
C**N
Avoid like the plague.
Utter rubbish. The flap kept falling off every time I tried to attach the hose so ended up leaving it off which kind of defeats the purpose.
D**S
Flimsy but works
The title says it all.
S**S
Great
Simple and effective.
K**Y
Good
Does the job
R**E
We had problems with the fan in our laser getting covered with a layer of black shiny creosote. Had to flake off with screwdriver. After thinking about it we thought maybe the damp air was turning the dust from basswood into a coating. IT WAS! Get this for venting a laser, keeps moisture out and cold air from coming in through your vent.
G**Y
A little costly, but the only one of its type i could find
A**R
Solid product.
M**.
Noisy and useless, when high winds come from the opposite side, the shutter opens anyway and it closes with a bang.
C**R
Bloquea el aire, todo lo que se le pide a este producto.
Trustpilot
2 weeks ago
2 weeks ago