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4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector

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$9.98

$ 4 .99 $4.99

In Stock

1.Color:Black


2.:4 Inch


  • 【Material】The 4 inch backdraft damper is made of a Galvanized steel, the flap leaves are made of aluminum
  • 【Installation】The backdraft damper 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 also applies to the vertical installation
  • 【Function】This airflow regulating backdraft shutter fits over the TD lip and is designed to improve ventilation by preventing air from re-circulating when the fans are not in use
  • 【Wide Application】 These backdraft dampers can be widely used in ACs, exhaust fans, extractors, range hoods, heating ducts, vents and other residential, commercial and industrial applications
  • 【Note】Back draught valves can be inserted into ventilation ducts which are flexible or non flexible. Cannot be used with plastic ducts as the sizes are different. All dimensions are measured manually, please allow 1-3mm differences



Product Description

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About Kikerike Backdraft Damper

The backdraft damper is made of a Galvanized steel, the flap leaves are made of aluminum

Designed for use in AC, dryer vent, exhaust, extractor or range hoods, heating systems, fans, vents and other residential, commercial and industrial HVAC applications.

Please consult and pay attention to product size before buying. Manual measurement, please allow slight errors on size. The colors may exist slight difference due to different screens.

Specifications

  • Color: silver
  • Diameter: 3.9" / 10cm; 4.88" / 12.5cm; 5.87" / 15cm; 7.83" / 20cm; 10" / 25cm; 12" / 30cm
  • Package includes: 1 x Balancing Barometric Damper
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Barb Moore
2025-09-05 12:06:55
This damper worked perfectly to solved my problem. It is quiet and installation was simple
Dee Folk
2025-08-20 21:55:47
This gadget worked great! Solved the drafty issue.
Customer
2025-07-25 12:46:53
Works as advertised. Good quality
Roger Paul
2025-07-21 18:24:54
I installed this inline for my over the range microwave oven. The damper that comes with the microwave oven wouldn’t work properly with a rectangular to round adapter. I tested this before final install and it worked fine. Just be sure you have the flow direction correct. I did find it difficult to get the aluminum vent pipe to mate with the damper. I finally got it then taped it real good.
T
2025-07-18 17:43:03
I had a high volume of backdraft coming out of my over the range microwave making the kitchen 12 degrees colder than the rest of the house when it gets cold. I played with the baffle that came with the microwave, which involves taking down the microwave each time, bouncing between allowing it to work but really not stopping any backdraft to it getting stuck preventing any stove venting getting through. If I had bought this 17 dollar (6in black) item before this last cold spell I would have saved hundreds of dollars on heating. Everything is quality with this. For such thin (lighter is better) sheet metal the vanes are perfectly flat and square making full contact with the generous gasket keeping all air out of the house. The lowest setting on the vent fully opens the vanes. Even the paint job, where only a 1/4" section can be seen when installed, looks high quality. Easy to install just pop off the vent cap outside, drop this in to the vent pipe (I then duct taped it because I didn't by a clamp) then tighten the vent cap back on to the other half of this.
Rod Mitchell
2025-07-12 12:44:29
I couldn't find this part anywhere but Amazon.
gr82nou
2025-05-13 11:28:59
If this vent is installed with the air flow going down, the springs will be challenged to close the vent due to the weight of the fins. Likewise if the orientation is horizontal with the hinge flap horizontal, the spring will struggle. The construction and fit is solid with a good seal when closed. Will do the job keeping in mind these conditions.
MJ
2025-05-09 11:28:56
Great for dryer vent or exhaust fan where you want to prevent back flow
Greg R.
2025-05-03 10:18:56
Good quality - feels like it will hold up to regular use. We attached it directly to the outside vent which has louvers. Since the flaps open proud of the outside opening, we taped it so the flaps would not bump up against the flaps while in use. I feel like I should use some sheet metal screws to hold it, but the fit is snug and the tape seems to hold it all together.
Dan
2025-04-12 10:21:16
the spring is too weak and the flaps don't close fully. DO NOT BUYI bought another one called FRESH SPEED and it has 2 springs and seals tightly
Ralphael
2025-03-25 10:51:21
I have allergies and apparently if I leave my portable Danby AC connected to the Window I wake up wheezing with Asthma or rather a type of bronchitis that fills my lungs with mucus from the allergies. Coughing and wheezing throughout the night. I had no idea that a backdraft damper existed or at least I could imagine that it existed but I had to search for "AC Duct air Blocker" to find that what I was looking for was a backdraft blocker. Measured twice the size of my Duct and it turns out that there are only three sizes 4", 6" and 8". My duct was 6.5". When my Draft Blocker arrived and I fitted it into the duct it was loosely fitted so I added a foam seal around the draft blocker and that made the backdraft blocker a tighter fit. Wasn't sure how far to push it into the duct but on the first try I decided to just have it near the entrance of the duct and that should be good enough. Checked that it was closed when my AC is not on and checked that I had Air flow when I turned on my AC by checking outside whether there was hot air blowing out of the exhaust. Yup works wonderfully. SOOOO theoretically without the outside air flowing through my AC duct I should have a good sleep tonight. I love how that if I have a problem such as a Backdraft on my AC Duct that I could find it on Amazon.
ken
2025-03-04 18:13:00
Damper fits over an existing 8" output. And has a foam gasket to make it quiet.
Tom Bargain
2025-02-11 15:45:37
We would get a crazy cold draft into the dryer from outside in the winter when dryer wasn't in use.This didn't fit into our ducting as smooth as hoped (our ducts had too many bends and narrow spots)but we made it work. It fixed the draft and condensation problem. Excellent product. Way better than the flap on the outside of the house.
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