---
product_id: 260366285
title: "Deflecto Duct Increaser and Reducer, Plastic Inline Adapter, White, 4” to 3” (IRB43)"
brand: "deflecto"
price: "€ 26.45"
currency: EUR
in_stock: true
category: "Home Improvement"
url: https://www.desertcart.de/products/260366285-deflecto-duct-increaser-and-reducer-plastic-inline-adapter-white-4
store_origin: DE
region: Germany
---

# 4" to 3" seamless duct transition 325°C heat-resistant polypropylene Lightweight at just 22.7g Deflecto Duct Increaser and Reducer, Plastic Inline Adapter, White, 4” to 3” (IRB43)

**Brand:** deflecto
**Price:** € 26.45
**Availability:** ✅ In Stock

## Summary

> 🔄 Upgrade your airflow game with seamless duct transitions!

## 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?** € 26.45 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/260366285-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

- • **Sleek White Finish:** Clean, professional look that blends seamlessly with modern home ventilation systems
- • **Space-Smart Compactness:** Slim profile and lightweight build make it perfect for tight bathroom fan setups
- • **Universal Compatibility:** Bridges 4" dryer exhausts to 3" ducts flawlessly, ensuring optimal airflow
- • **Heat-Resistant Durability:** Crafted from polypropylene with a 325°C melting point to withstand high temps safely
- • **Effortless Fit & Flexibility:** Slip-on design for quick, clamp-secured installation—no fuss, no tools needed

## Overview

The Deflecto Duct Increaser and Reducer (IRB43) is a lightweight, durable plastic adapter designed to connect 4-inch ducts to 3-inch ducts effortlessly. Made from heat-resistant polypropylene with a melting point of 325°C, it ensures safe and reliable performance in bathroom fan and dryer exhaust installations. Its slip-on design allows for quick setup, making it an essential upgrade for efficient home ventilation.

## Description

DeflectoDuct 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 |
|---------------|-------|
| Manufacturer | Deflecto |
| Part number | DEFIRB43 |
| Item Weight | 22.7 g |
| Product Dimensions | 10.16 x 8.64 x 10.16 cm; 22.68 g |
| Item model number | IRB43 |
| Color | White |
| Material | Plastic |
| Item Package Quantity | 1 |
| Number Of Pieces | 1 |
| Special Features | Lightweight |
| Included components | Deflecto Duct Plastic Increaser and Reducer, 4" to a 3", (IRB43) |
| 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)

## 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.de/products/260366285-deflecto-duct-increaser-and-reducer-plastic-inline-adapter-white-4](https://www.desertcart.de/products/260366285-deflecto-duct-increaser-and-reducer-plastic-inline-adapter-white-4)

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*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-04-01*