--- product_id: 11466289 title: "Deflecto Duct Increaser and Reducer, Plastic Inline Adapter, White, 4” to 3” (IRB43)" brand: "deflecto" price: "€ 14.66" currency: EUR in_stock: true category: "Deflecto" url: https://www.desertcart.at/products/11466289-deflecto-duct-increaser-and-reducer-plastic-inline-adapter-white-4 store_origin: AT region: Austria --- # 4” to 3” seamless duct transition 325°F heat-resistant polypropylene lightweight at just 22.68g Deflecto Duct Increaser and Reducer, Plastic Inline Adapter, White, 4” to 3” (IRB43) **Brand:** deflecto **Price:** € 14.66 **Availability:** ✅ In Stock ## Summary > 🔧 Upgrade your airflow game with seamless style and durability! ## 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?** € 14.66 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/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 - • **Sleek & Lightweight:** Minimal 22.68g weight means easy handling without bulk or strain. - • **Trusted Brand Legacy:** From Deflecto, a global leader with 50+ years of innovation in air distribution solutions. - • **Versatile HVAC Essential:** Perfect for bathroom fans and dryer exhausts, ensuring optimal airflow and performance. - • **Heat-Resilient Durability:** Crafted from polypropylene with a 325°F melting point to withstand high temps safely. - • **Effortless Duct Adaptation:** Slip-on design for quick 4” to 3” duct resizing—no fuss, no stress. ## Overview The Deflecto Duct Increaser and Reducer (IRB43) is a durable, lightweight polypropylene adapter designed to connect 4-inch exhaust hoods to 3-inch ducts. Heat-resistant up to 325°F, it ensures reliable performance for bathroom fans and dryer vents, backed by Deflecto’s 50+ years of trusted manufacturing excellence. ## Description Product Description Adapt your 3” duct to a 4” exhaust hood with the Deflecto Duct Increaser and Reducer. This polypropylene plastic connector is an ideal connector when installing bathroom fans as well. Slip the ducts over the ends of the increaser/reducer, and tighten down with clamps (not included). Durable and lightweight, this reducer has a melting point of approximately 325 degrees F. Deflecto was founded on innovative, problem solving products. For over a half century, we have built a tradition of discovering and meeting needs with invention and dependable manufacturing. Today, Deflecto is the world’s largest chair mat, bicycle reflector and dryer venting manufacturer and a global leader in sign and literature holders, office workspace accessories and other air distribution products. From the Manufacturer Deflecto Irb43 Plastic Reducer 4 inch To 3 inch ; Allows Use Of 4 inch Exhaust Hood With 3 inch Duct; Plastic Material allows for light weight design ## 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 | |---------------|-------| | ASIN | B005XU3QCQ | | Best Sellers Rank | #137,543 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #293 in HVAC Ducting | | Brand Name | Deflecto | | Color | White | | Connector Type | Reducer | | Customer Reviews | 4.3 4.3 out of 5 stars (766) | | EU Spare Part Availability Duration | 5 Years | | Exterior Finish | Chrome | | Global Trade Identification Number | 00079916700113 | | Included Components | Deflecto Duct Plastic Increaser and Reducer | | Item Dimensions | 4 x 3.4 x 4 inches | | Item Type Name | Deflecto Duct Plastic Increaser and Reducer, 4" to a 3", (IRB43) | | Item Weight | 22.68 g | | Manufacturer | Deflecto | | Manufacturer Part Number | DEFIRB43 | | Manufacturer Warranty Description | Deflecto Duct Plastic Increaser and Reducer, 4" to a 3", (IRB43) | | Material Type | Plastic | | Model Number | IRB43 | | Number of Pieces | 1 | | Size | No Size | | UPC | 079916700113 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** Deflecto - **Color:** White - **Connector Type:** Reducer - **EU Spare Part Availability Duration:** 5 Years - **Exterior Finish:** Chrome - **Item Weight:** 22.68 g - **Item dimensions L x W x H:** 4 x 3.4 x 4 inches - **Material:** Plastic - **Number of Pieces:** 1 - **Size:** No Size ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.at/products/11466289-deflecto-duct-increaser-and-reducer-plastic-inline-adapter-white-4](https://www.desertcart.at/products/11466289-deflecto-duct-increaser-and-reducer-plastic-inline-adapter-white-4) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-07-09*