---
product_id: 48535372
title: "Kair 125mm to 100mm Round Duct Reducer"
brand: "kair"
price: "€ 23.91"
currency: EUR
in_stock: true
category: "Kair"
url: https://www.desertcart.hr/products/48535372-kair-125mm-to-100mm-round-duct-reducer
store_origin: HR
region: Croatia
---

# 125mm to 100mm precision fit Universal compatibility with Kair SYS-100 & SYS-125 Lightweight durable plastic, 0.09 lbs Kair 125mm to 100mm Round Duct Reducer

**Brand:** kair
**Price:** € 23.91
**Availability:** ✅ In Stock

## Summary

> 🔧 Upgrade your airflow game with precision and style!

## Quick Answers

- **What is this?** Kair 125mm to 100mm Round Duct Reducer by kair
- **How much does it cost?** € 23.91 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/48535372-kair-125mm-to-100mm-round-duct-reducer)

## Best For

- kair enthusiasts

## Why This Product

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

## Key Features

- • **Seamless Size Transition:** Effortlessly adapts 125mm ducts to 100mm for perfect airflow.
- • **Plug & Play Compatibility:** Fits over push-fit connectors and integrates with Kair’s extensive ducting range.
- • **UK-Made Quality Assurance:** Crafted in the UK with premium plastic for long-lasting performance.
- • **Space-Saving Compact Design:** Slim 5.1cm profile ensures easy installation in tight spaces.
- • **Versatile Ventilation Solution:** Ideal for tumble dryers, extractor fans, cooker hoods, and hydroponics setups.

## Overview

The Kair 125mm to 100mm Round Duct Reducer is a lightweight, UK-manufactured plastic adapter designed to seamlessly connect 125mm ducting to 100mm systems. Compatible with Kair’s SYS-100 and SYS-125 fittings, it’s perfect for enhancing ventilation in dryers, extractor fans, cooker hoods, and hydroponic setups, ensuring efficient airflow with easy installation.

## Description

Free delivery and returns on all eligible orders. Shop Kair 125mm to 100mm Round Duct Reducer | Fits over fittings (bends etc), For dryer vents and cooker hoods and extractor fans, Suitable for grow tents and hydroponics.

## Features

- Adapter to convert 125mm to 100mm ducting - 5" to 4"
- On one side there is a 125mm female spigot. Fits over push-fit connectors (bends, etc.) Requires an additional 125mm plug to connect round 125mm pipe.
- On the other side there is a 100mm spigot. Fits in 100mm straight ducting
- Compatible with 100mm and 125mm ducting systems, including the extensive Kair SYS-100 and SYS-125 range of fittings, sockets and grilles.
- Perfectly suited for conducting your tumble dryer, bathroom or kitchen extractor fan, hydroponics, in-line fans or cooker hoods and other ventilation applications.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004X4S7QI |
| Best Sellers Rank | 4,451 in DIY & Tools ( See Top 100 in DIY & Tools ) 5 in Ducting |
| Brand | Kair |
| Colour | White |
| Connector Type | Plug, Coupling, Reducer |
| Connector type | Plug, Coupling, Reducer |
| Country of Origin | United Kingdom |
| Customer Reviews | 4.5 out of 5 stars 2,632 Reviews |
| Item Dimensions | 5.1 x 5.1 centimetres |
| Item Highlight | Fits over fittings (bends etc), For dryer vents and cooker hoods and extractor fans, Suitable for grow tents and hydroponics |
| Item Weight | 0.09 Pounds |
| Item dimensions L x W x H | 5.1 x 5.1 centimetres |
| Manufacturer | Kair |
| Material | Plastic |
| Model Number | DUCVKC603 |
| Number of Packs | 1 |
| Number of Pieces | 1 |
| Part Number | DUCVKC603 |
| Size | 125mm to 100mm |
| Thread Size | 125mm, 100mm |

## Product Details

- **Brand:** Kair
- **Colour:** White
- **Connector type:** Coupling, Plug, Reducer
- **Item dimensions L x W x H:** 5.1 x 5.1 centimetres
- **Item weight:** 41 g
- **Material:** Plastic
- **Number of Packs:** 1
- **Number of pieces:** 1
- **Size:** 125mm to 100mm
- **Thread size:** 125mm, 100mm

## Images

![Kair 125mm to 100mm Round Duct Reducer - Image 1](https://m.media-amazon.com/images/I/415Hw3eWTlL.jpg)
![Kair 125mm to 100mm Round Duct Reducer - Image 2](https://m.media-amazon.com/images/I/613-NFUqxVL.jpg)
![Kair 125mm to 100mm Round Duct Reducer - Image 3](https://m.media-amazon.com/images/I/51fa6xd9vZL.jpg)
![Kair 125mm to 100mm Round Duct Reducer - Image 4](https://m.media-amazon.com/images/I/51KNqw4oMJL.jpg)
![Kair 125mm to 100mm Round Duct Reducer - Image 5](https://m.media-amazon.com/images/I/71t3r9eNHjL.jpg)

## Questions & Answers

**Q: Is this a one piece adaptor (150mm>100mm) or two pieces together (150mm>125mm then 125mm>100mm)?**
A: It was over a year ago, however from memory it was a one piece adapter which I used for an over the cooker extractor. Hope this is useful

**Q: New extractor fan 120mm outlet. Existing flexible hose 100mm. Anything needed besides this and clip?**
A: Not really. One end wedged onto my extractor fan and the other on the piping. I didn't have a clip so just used gaffa tape 😉

## Frequently Bought Together

- Kair Straight Ducting Reducer/Adaptor - SYS-125 / SYS-100 - DUCVKC603 125 mm to 100 mm Kair
- Kair PVC Flexible Hose 125mm - 5 inch Universal Tumble Drier, Cooker Hood, Extractor Fan, Air Conditioner Hose - 3 Metre Length
- 125mm Pack of 2 Adjustable 120-140mm Stainless Steel Pipe Clamp Secure Hose Clip Inline Duct Extractor Fan Cooker Hood

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**Shop now:** [https://www.desertcart.hr/products/48535372-kair-125mm-to-100mm-round-duct-reducer](https://www.desertcart.hr/products/48535372-kair-125mm-to-100mm-round-duct-reducer)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-09-20*