---
product_id: 52216896
title: "– Kair Ducting Adaptor 110mm x 54mm to 100mm - 4 inch Rectangular to Round Straight Channel Connector for Converting to Different Size Duct Systems"
brand: "kair"
price: "128 Lei"
currency: RON
in_stock: true
reviews_count: 13
category: "Kair"
url: https://www.desertcart.ro/products/52216896-kair-ducting-adaptor-110mm-x-54mm-to-100mm-4-inch
store_origin: RO
region: Romania
---

# 110x54mm to 100mm size conversion Seamless rectangular to round duct transition Lightweight 90.7g polystyrene build – Kair Ducting Adaptor 110mm x 54mm to 100mm - 4 inch Rectangular to Round Straight Channel Connector for Converting to Different Size Duct Systems

**Brand:** kair
**Price:** 128 Lei
**Availability:** ✅ In Stock

## Summary

> 🔧 Upgrade your airflow game with seamless ducting transitions!

## Quick Answers

- **What is this?** – Kair Ducting Adaptor 110mm x 54mm to 100mm - 4 inch Rectangular to Round Straight Channel Connector for Converting to Different Size Duct Systems by kair
- **How much does it cost?** 128 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/52216896-kair-ducting-adaptor-110mm-x-54mm-to-100mm-4-inch)

## 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

- • **Space-Smart Design:** Compact profile ideal for tight installations without compromising performance.
- • **Universal Compatibility:** Works seamlessly with a wide range of plastic duct fittings, outlets, and grilles for flexible setups.
- • **Trusted Quality Assurance:** Backed by Kair’s 100% satisfaction guarantee, ensuring peace of mind on every project.
- • **Durable Polystyrene Construction:** Lightweight yet sturdy material ensures long-lasting reliability and easy handling.
- • **Precision Fit for Versatile Systems:** Easily connects 110x54mm rectangular ducts to 100mm round pipes for flawless airflow integration.

## Overview

The Kair Ducting Adaptor converts 110mm x 54mm rectangular ducts to 100mm round pipes, crafted from durable polystyrene for lightweight strength. Its compact design fits tight spaces and is compatible with a broad range of plastic duct fittings, backed by a 100% satisfaction guarantee.

## Description

Kair Ducting Adaptor 110mm x 54mm to 100mm - 4 inch Rectangular to Round Straight Channel Connector RECTANGULAR 110mm x 54mm The flat end is a female spigot and fits over 110mm x 54mm Rectangular Duct Pipe Part: DUCVKC249. ROUND 100mm / 4 inch Circular end is a 100mm round female spigot that will accept any male 100mm round fittings. br> Requires round duct connector Part: DUCEK28 to connect to 100mm straight pipe - Part: DUCVKC250. Allows you to convert between round and rectangular ducting systems.Made in the UK using high-quality Polystyrene/Polypropylene plastic.Max / Min Temperature: +60c / -15c.Easy to install and durable, just push-fit duct and fittings together. For permanent fixings, seal joints with silicone sealant or tape.Airflow performance independently tested by BSRIA or BRE.Suitable to use in compliance with Part F Building Regulations.Static Pressure Drop in Pascals: 15 l/s = 3.70 Pa - 30 l/s = 14.60 Pa - 60 l/s = 58.00 Pa.Perfectly suited for ducting your Bathroom or Kitchen extractor fan, hydroponics, in-line extract Fans, tumble dryer, or cooker hood. This item can be used as a part of a long ductwork run for a variety of purposes including whole house ventilation, passive stack vent, positive input ventilation, air conditioning, HVAC, and Heat Recovery systems. Kair plastic rigid ducting is perfect for DIY and Trade use and provides superior airflow performance and durability versus flexible duct.

Review: Dutch Adaptor - Nice product
Review: Does it's job., great price. - My son's cooker hood currently vented out of a roof tile vent that was straight up from the extractor hood in his bungalow, so warm moist kitchen air into a cold attic created condensation inside the ducting, the colder the loft space was, to the extent that sometimes water was running backwards into the hood. My solution was to take the 150mm duct up at a slight angle from vertical to another right angle, then to a 150mm round to 220/90mm adaptor from round to rectangle, onto a similar sized flexible ducting, over the wall plate into the soffit void & out via a 150mm round vent grill, adding insulation to the ducting should hopefully cure the problem as most of the ducting run now runs downhill towards the vent. I got this with some other ventilation bits, handy to locate all in one order via desertcart, paid a fair price without any hassle of having to locate various different parts. The item is all as expected, fits well & finishes off the job nicely.

## Features

- RECTANGULAR END: 110mm x 54mm Fits over rectangular duct pipe.
- ROUND END: 100mm (4 inch) Fits over other connectors and fittings, pipe requires additional connector.
- Allows you to convert between round and rectangular ducting systems.
- Kair short rectangular to round connector is perfect for installs where space is limited.
- Kair 100% Satisfaction Guarantee. Compatible with the extensive range of plastic ducting fittings, outlets, and grilles

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Kair |
| Part Number | DUCVKC253F |
| Product Dimensions | 12 x 11.4 x 10.7 cm; 90.72 g |
| Manufacturer reference | DUCVKC253F |
| Size | 110mm x 54mm to 100mm |
| Colour | White |
| Material | Polystyrene |
| Item Package Quantity | 1 |
| Number of Pieces | 1 |
| Batteries included? | No |
| Batteries Required? | No |
| Item Weight | 90.7 g |

## Product Details

- **Size:** 110mm x 54mm to 100mm
- **Material:** Polystyrene
- **Brand:** Kair
- **Colour:** White
- **Item dimensions L x W x H:** 12 x 11.4 x 10.7 centimetres
- **Connector type:** Adapter
- **Thread size:** 100mm
- **Thread type:** UN
- **Item weight:** 91 g
- **Number of pieces:** 1

## Images

![– Kair Ducting Adaptor 110mm x 54mm to 100mm - 4 inch Rectangular to Round Straight Channel Connector for Converting to Different Size Duct Systems - Image 1](https://m.media-amazon.com/images/I/41BZCtM3oSL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Dutch Adaptor
*by J***E on 18 September 2025*

Nice product

### ⭐⭐⭐⭐⭐ Does it's job., great price.
*by J***N on 24 December 2023*

My son's cooker hood currently vented out of a roof tile vent that was straight up from the extractor hood in his bungalow, so warm moist kitchen air into a cold attic created condensation inside the ducting, the colder the loft space was, to the extent that sometimes water was running backwards into the hood. My solution was to take the 150mm duct up at a slight angle from vertical to another right angle, then to a 150mm round to 220/90mm adaptor from round to rectangle, onto a similar sized flexible ducting, over the wall plate into the soffit void & out via a 150mm round vent grill, adding insulation to the ducting should hopefully cure the problem as most of the ducting run now runs downhill towards the vent. I got this with some other ventilation bits, handy to locate all in one order via Amazon, paid a fair price without any hassle of having to locate various different parts. The item is all as expected, fits well & finishes off the job nicely.

### ⭐⭐⭐⭐ Pretty good
*by M***C on 4 November 2023*

Not a bad adaptor, used in dual pairs to cross-over-under a set of ducts that were in an awkward height in my MVHR setup, eliminating a low-spot in the ducting that could have been a problem later on. It also came in quite handy for passing a duct over a pair of wooden beams that I couldn't cut through for the 100mm round pipe because it was load-bearing. It fitted with a good inch to spare, which was good as it left room for insulation around the ductwork. The end result is a professional-looking rigid setup that should last many years to come, instead of resorting to flexible ducting which always looks like a messy afterthought. The only let down is there are a couple of internal seams which protrude, but a few seconds with some sandpaper easily flattened those down.

## Frequently Bought Together

- Kair Ducting Adaptor 110mm x 54mm to 100mm - 4 inch Rectangular to Round Straight Channel Connector for Converting to Different Size Duct Systems
- Kair Rectangular Flat Ducting 110mm x 54mm - 1 Metre Length Flat Channel Pipe
- Kair 110 mm x 54 mm Rectangular to Round (100 mm Male Spigot) 90 Degree Bend - SYS-100 - DUCVKC237 by Kair

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-01-22*