Can this be used to stop my Hot water tank from blowing out the flame on windy days?

sorry, I did not use it for the flame from HWT.

can this be used on a dryer vent or will the foam seal melt?

I would say the dryer heat could damage or maybe even melt the seal. Maybe you could try removing the gasket and wrap a strip of fiberglass in it’s place.

Would this help keep out bugs?

Yes it creates a barrier and only opens one way from the inside of house

Would this fit between two sections of standard, 4 inch semi-rigid ducting? Looking to add to bathroom vent fan ductwork.

Yes, that's exactly how you would use it. Make sure to buy the correct HVAC aluminum (metallic) duct tape for the connection. A clamp cannot be used bc the crushing pressure would inhibit the flapper from working properly.

4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💨 Seal the deal on fresh airflow—never let drafts steal your comfort!

EFFORTLESS INSTALLATION - Simply push into any 4-inch ventilation pipe with spring alignment for optimal flap movement—no tools required.
PREVENT COSTLY BACKDRAFTS - Effectively stops unwanted air recirculation and backflow, enhancing indoor air quality and energy efficiency.
OPTIMIZED AIRFLOW EFFICIENCY - Designed to open easily even at low CFM, reducing airflow restriction to under 10%, perfect for sensitive HVAC setups.
UNIVERSAL VENT COMPATIBILITY - Ideal for residential, commercial, and industrial ducts including ACs, exhaust fans, range hoods, and heating vents.
DURABLE INDUSTRIAL GRADE MATERIALS - Crafted from galvanized steel and aluminum for long-lasting performance and corrosion resistance.

This 4-inch backdraft damper features a galvanized steel body with aluminum flaps and a spring-loaded mechanism to ensure smooth, one-way airflow. Engineered for easy push-in installation, it minimizes airflow restriction to under 10%, making it ideal for low CFM applications like bathroom exhausts and kitchen vents. Compatible with most metal ducts, it prevents backdrafts and improves ventilation efficiency across residential, commercial, and industrial settings.

Reviews

C**B

27.03.2026

C**E

21.04.2026

J**N

23.01.2026

J**.

28.01.2026

B**L

16.02.2026

C**G

21.04.2026

P**N

4.02.2026

X**U

4.04.2026

N**.

22.01.2026

S**I

8.02.2026

J**H

17.03.2026

A**R

7.02.2026

G**T

15.04.2026

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Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

€ 27.00

Duties & taxes included

In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Spain.

Secure transaction

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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ASIN	B099KGNZRL
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#6,909 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #11 in HVAC Ducting
Color	Silver
Customer Reviews	4.6 4.6 out of 5 stars (1,198)
Date First Available	July 15, 2021
Item Package Quantity	1
Item Weight	4.2 ounces
Manufacturer	Kikerike
Package Dimensions	6.26 x 4.88 x 3.9 inches
Size	4 Inch

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

Description

Specifications

Reviews

Common Questions