---
product_id: 653197448
title: "100 mm / 4\" Inch Backdraft Damper Stopper - ABS Plastic Male Fit Dryer Vent Backflow with Shutter - One-Way Airflow Ducting Insert - Inline Fan Vent, Exhaust Pipe Adapter/Connector"
brand: "vent systems"
price: "¥4202"
currency: JPY
in_stock: true
reviews_count: 13
category: "Vent Systems"
url: https://www.desertcart.jp/products/653197448-100-mm-4-inch-backdraft-damper-stopper-abs-plastic-male
store_origin: JP
region: Japan
---

# One-way airflow control Precise 100mm fit Durable ABS plastic 100 mm / 4" Inch Backdraft Damper Stopper - ABS Plastic Male Fit Dryer Vent Backflow with Shutter - One-Way Airflow Ducting Insert - Inline Fan Vent, Exhaust Pipe Adapter/Connector

**Brand:** vent systems
**Price:** ¥4202
**Availability:** ✅ In Stock

## Summary

> 💨 Stop drafts, start comfort — your airflow’s new best friend!

## Quick Answers

- **What is this?** 100 mm / 4" Inch Backdraft Damper Stopper - ABS Plastic Male Fit Dryer Vent Backflow with Shutter - One-Way Airflow Ducting Insert - Inline Fan Vent, Exhaust Pipe Adapter/Connector by vent systems
- **How much does it cost?** ¥4202 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/653197448-100-mm-4-inch-backdraft-damper-stopper-abs-plastic-male)

## Best For

- vent systems enthusiasts

## Why This Product

- Trusted vent systems brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Backdraft Blocker:** Innovative shutter design prevents cold air, wind, and odors from sneaking back into your space.
- • **Built to Last with ABS:** Crafted from high-strength, eco-friendly ABS plastic for long-lasting durability in any ventilation setup.
- • **Effortless Installation:** Slide-in design fits most standard ducts—no special tools needed, just secure with tape or clamps.
- • **Versatile HVAC Essential:** Ideal for dryers, extractor fans, kitchen hoods, and bathroom vents to maintain comfort and efficiency.
- • **Seamless 100mm Connection:** Engineered for a perfect male-fit coupling that ensures airtight duct alignment and optimal airflow.

## Overview

The Vent Systems 100mm Backdraft Damper Stopper is a precision-engineered ABS plastic duct insert designed to prevent unwanted backflow of air, odors, and drafts in ventilation systems. Its one-way shutter mechanism ensures efficient airflow direction, while the durable, eco-friendly material guarantees long-term performance. Easy to install and compatible with standard 100mm ducts, it’s the perfect upgrade for residential and commercial HVAC setups seeking enhanced comfort and energy efficiency.

## Description

Free delivery and returns on eligible orders. Buy Vent Systems 100 mm / 4" Inch Backdraft Damper Stopper - ABS Plastic Male Fit Dryer Vent Backflow with Shutter - One-Way Airflow Ducting Insert - Inline Fan Vent, Exhaust Pipe Adapter/Connector at desertcart UK.

Review: Good quality, easy to fit. - Good quality, easy to fit and so far, does a good job. Only time will tell if it lasts?
Review: Keeps out the draughts - I bought 2 of these to replace older ones that were no longer swinging shut properly and they work well, keeping out the backdraft when the fan is not in use and keeping the bathroom noticeably warmer. Slides into standard 100mm ducting pipe.

## Features

- PRECISE MEASUREMENTS: This male-fit coupler connects two Ø3.90" / 99mm round ducting pipes in a straight line, ensuring a secure and smooth alignment. Overall length: 2.44" / 62mm. Flange thickness: 0.06" / 1.5mm. The backflow damper opens and closes automatically.
- MATERIAL & DURABILITY: Crafted from durable ABS plastic, this material offers high strength, excellent toughness, and ease of processing. It's environmentally friendly and non-toxic, making it a safe choice for both residential and commercial ducting applications, including tumble dryer vents, extractor fans, ventilation systems, and cooker hoods.
- FUNCTIONALITY: Duct draft stopper prevent cold air or wind from entering the ventilation pipe. In this case, the flap is installed in such a way that the flap leaves only open into the outgoing air direction. This means that no cold air / wind or smell can penetrate the ventilation pipe from the outside.
- EASY INSTALLATION: Designed to fit most extractor fans, bathroom fans, kitchen exhaust fans, in-line extract fans, cooker hoods, and various heating or cooling ducts. Just slide the flange into your round ducts and secure it with duct tape, pipe clamp / pipe bracket, or sealant for a quick and straightforward installation (MOUNTING HARDWARE NOT INCLUDED).
- APPLICATION: The backflow preventer valve is installed by pushing it into the HVAC PVC pipe / plastic pipe. The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally. Pipe fitting for use in an air duct, duct vent or AC duct. For home improvement - home, kitchen, bathroom or garage / shed.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08PKPDQS2 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 6,955 in DIY & Tools ( See Top 100 in DIY & Tools ) 32 in Registers, Grilles & Vents |
| Colour | White |
| Customer Reviews | 4.5 4.5 out of 5 stars (178) |
| Date First Available | 2 Nov. 2022 |
| Finish | Powder Coated, Glossy White |
| Included Components | Pipe Connector |
| Item Package Quantity | 1 |
| Item Weight | 50 g |
| Item model number | 6f6d0160-6112-46e3-9e91-9568b562d558 |
| Manufacturer | Vent Systems |
| Material | Plastic |
| Number of Pieces | 1 |
| Plug profile | Wall Mount |
| Power Source | USB power |
| Product Dimensions | 10.31 x 10.31 x 6.2 cm; 50 g |
| Shape | Circular |
| Size | 100 mm / 3.94" w/Backdraft Damper |
| Special Features | Easy to Install |
| Style | Industrial |
| Switch style | Push Button |

## Product Details

- **Brand:** Vent Systems
- **Colour:** White
- **Connector type:** Adapter
- **Item dimensions L x W x H:** 10.3 x 10.3 x 6.2 centimetres
- **Manufacturer:** Vent Systems
- **Material:** Plastic
- **Number of pieces:** 1
- **Size:** 100 mm / 3.94" w/Backdraft Damper
- **Thread type:** BSP

## Images

![100 mm / 4" Inch Backdraft Damper Stopper - ABS Plastic Male Fit Dryer Vent Backflow with Shutter - One-Way Airflow Ducting Insert - Inline Fan Vent, Exhaust Pipe Adapter/Connector - Image 1](https://m.media-amazon.com/images/I/51kNDYHz2oL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good quality, easy to fit.
*by P***L on 1 January 2026*

Good quality, easy to fit and so far, does a good job. Only time will tell if it lasts?

### ⭐⭐⭐⭐⭐ Keeps out the draughts
*by S***. on 2 December 2025*

I bought 2 of these to replace older ones that were no longer swinging shut properly and they work well, keeping out the backdraft when the fan is not in use and keeping the bathroom noticeably warmer. Slides into standard 100mm ducting pipe.

### ⭐⭐⭐⭐⭐ Draught excluder
*by M***K on 7 January 2026*

Fitted both of these and the rooms are noticeably warmer. Totally removed the draught coming in from the extractor fans. Will pay for themselves rather quickly I would think.

## Frequently Bought Together

- Vent Systems 4'' Inch Backdraft Damper - Dryer Vent Backflow Shutter - ABS Plastic - One-Way Airflow Ducting Insert - Inline Fan Vent Deflector 4'' Inch
- EesTeck 4" (Diameter) Adjustable 304 Stainless Steel Duct Clamps Hose Clamp Pipe Clamp Air Ducting Clamp worm drive hose clamps (4Pcs, 91mm-114mm)
- Vent Systems 4'' Inch Duct Connector 3 Way Hose Adapter ABS Plastic/Splitter for Hose T-Shape Round Pipe Connector- Extractor Fan - Duct Hose Dryer Vent T Connector - 4 Inch 3 Way Fitting

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**Shop now:** [https://www.desertcart.jp/products/653197448-100-mm-4-inch-backdraft-damper-stopper-abs-plastic-male](https://www.desertcart.jp/products/653197448-100-mm-4-inch-backdraft-damper-stopper-abs-plastic-male)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-04*