---
product_id: 11466289
title: "Deflecto Duct Increaser and Reducer, Plastic Inline Adapter, White, 4” to 3” (IRB43)"
brand: "deflecto"
price: "€ 15.13"
currency: EUR
in_stock: true
url: https://www.desertcart.fr/products/11466289-deflecto-duct-increaser-and-reducer-plastic-inline-adapter-white-4
store_origin: FR
region: France
---

# 4" to 3" transition Durable up to 325°F Easy installation Deflecto Duct Increaser and Reducer, Plastic Inline Adapter, White, 4” to 3” (IRB43)

**Brand:** deflecto
**Price:** € 15.13
**Availability:** ✅ In Stock

## Summary

> 🔧 Transform Your Duct Game!

## Quick Answers

- **What is this?** Deflecto Duct Increaser and Reducer, Plastic Inline Adapter, White, 4” to 3” (IRB43) by deflecto
- **How much does it cost?** € 15.13 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/11466289-deflecto-duct-increaser-and-reducer-plastic-inline-adapter-white-4)

## Best For

- deflecto enthusiasts

## Why This Product

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

## Key Features

- • **Lightweight Design:** Weighing only 0.8 ounces, it's easy to handle and install.
- • **Durable Polypropylene:** Built to last with a high melting point of 325°F.
- • **Versatile Applications:** Perfect for bathroom fans and dryer exhausts.
- • **Seamless Duct Transition:** Effortlessly connect 4" and 3" ducts for a perfect fit.
- • **User-Friendly Installation:** Simply slip and tighten with clamps for a secure connection.

## Overview

The Deflecto Duct Increaser and Reducer (Model IRB43) is a lightweight, durable plastic inline adapter designed to seamlessly transition between 4" and 3" diameter ducts. Ideal for bathroom fan installations and dryer exhausts, it ensures a secure fit with easy installation, making it a must-have for any home improvement project.

## Description

Deflecto Duct Increaser and Reducer, Plastic Inline Adapter, White, 4” to 3” (IRB43)

## Features

- Designed to transition between 4" and 3" diameter ducts
- Simply slip the ducts over the increaser/reducer, tightening in place with clamps (not included)
- Durable polypropylene construction has a melting point of approximately 325 degrees
- Connects a 4 inch dryer exhaust hood to a 3 inch duct
- Ideal for bathroom fan installations

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand Name | Deflecto |
| Model Info | IRB43 |
| Item Weight | 0.8 ounces |
| Product Dimensions | 4 x 3.4 x 4 inches |
| Item model number | IRB43 |
| Is Discontinued By Manufacturer | No |
| Part Number | DEFIRB43 |
| Special Features | Lightweight |
| Color | White |
| Connector Type | Reducer |
| Material Type | Plastic |
| Included Components | Deflecto Duct Plastic Increaser and Reducer |
| Batteries Included? | No |
| Batteries Required? | No |

## Images

![Deflecto Duct Increaser and Reducer, Plastic Inline Adapter, White, 4” to 3” (IRB43) - Image 1](https://m.media-amazon.com/images/I/71ynkr5cqxL.jpg)
![Deflecto Duct Increaser and Reducer, Plastic Inline Adapter, White, 4” to 3” (IRB43) - Image 2](https://m.media-amazon.com/images/I/81HqUUIX5qL.jpg)

## Frequently Bought Together

- Deflecto Duct Increaser and Reducer, Plastic Inline Adapter, White, 4” to 3” (IRB43)
- Daisypower Dryer Vent Window Kit, Adjustable Window Vent Kit with Outdoor Dryer Vent Cover,4 Inch Hood for Exhaust Ventilation
- AC Infinity Flexible 4-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 8-Feet Long for Heating Cooling Ventilation and Exhaust

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**Shop now:** [https://www.desertcart.fr/products/11466289-deflecto-duct-increaser-and-reducer-plastic-inline-adapter-white-4](https://www.desertcart.fr/products/11466289-deflecto-duct-increaser-and-reducer-plastic-inline-adapter-white-4)

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*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-01-22*