--- product_id: 430313868 title: "Repa Market 8\" to 4\" Inch Duct Reducer/Increaser – Galvanized Steel Vent Pipe Adapter HVAC & Dryer Vent Systems – Round Metal Coupling Connector for Exhaust Fans, Bathroom Ventilation, Kitchen Hoods" brand: "repa market" price: "409 Lei" currency: RON in_stock: true category: "Repa Market" url: https://www.desertcart.ro/products/430313868-repa-market-8-to-4-inch-duct-reducer-increaser-galvanized store_origin: RO region: Romania --- # Precise 3.89" to 7.83" fit Dual reducer/increaser function Heavy-duty galvanized steel Repa Market 8" to 4" Inch Duct Reducer/Increaser – Galvanized Steel Vent Pipe Adapter HVAC & Dryer Vent Systems – Round Metal Coupling Connector for Exhaust Fans, Bathroom Ventilation, Kitchen Hoods **Brand:** repa market **Price:** 409 Lei **Availability:** ✅ In Stock ## Summary > 🔧 Upgrade Your Airflow Game with Precision & Durability! ## Quick Answers - **What is this?** Repa Market 8" to 4" Inch Duct Reducer/Increaser – Galvanized Steel Vent Pipe Adapter HVAC & Dryer Vent Systems – Round Metal Coupling Connector for Exhaust Fans, Bathroom Ventilation, Kitchen Hoods by repa market - **How much does it cost?** 409 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/430313868-repa-market-8-to-4-inch-duct-reducer-increaser-galvanized) ## Best For - repa market enthusiasts ## Why This Product - Trusted repa market brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Perfect Fit Every Time:** Engineered with exact outer diameters (3.89" to 7.83") for seamless duct transitions—no leaks, no fuss. - • **Versatile Airflow Master:** Functions as both reducer and increaser, optimizing airflow for HVAC, dryer vents, and exhaust fans. - • **DIY-Friendly Installation:** Push-fit design ensures quick, hassle-free setup for pros and weekend warriors alike. - • **Built to Brave the Elements:** Crafted from rust-resistant galvanized steel to withstand moisture and corrosion in any environment. - • **Universal Ventilation Solution:** Ideal for everything from kitchen hoods to bathroom fans—upgrade your airflow game effortlessly. ## Overview This 8" to 4" galvanized steel duct reducer/increaser offers precise sizing and robust corrosion resistance, ensuring a secure, leak-free connection for HVAC, dryer vents, and exhaust systems. Its dual functionality and easy push-fit installation make it a must-have for professional and DIY ventilation projects. ## Description Repa Market 8" to 4" Inch Duct Reducer/Increaser – Galvanized Steel Vent Pipe Adapter HVAC & Dryer Vent Systems – Round Metal Coupling Connector for Exhaust Fans, Bathroom Ventilation, Kitchen Hoods - desertcart.com ## Features - PRECISE MEASUREMENTS – Small end outer diameter: 3.89" Inches; Widest end outer diameter: 7.83" Inches; Overall depth 5.35" Inches; Transition length in middle after connecting 2.56" Inches; fits solid or flexible ducting for HVAC dryer vents and exhaust fans. - MATERIAL & DURABILITY – Heavy-duty galvanized steel resists rust, moisture, and corrosion; built to last for residential, commercial, and industrial ducting applications. - FUNCTIONALITY & FEATURES – Works as a reducer or increaser; ensures secure fit for ventilation fans, dryer ducts, and exhaust vent pipes while maintaining high airflow efficiency. - INSTALLATION & USE – Simple push-fit installation for quick DIY or professional projects; compatible with flexible dryer vent hose, rigid duct pipe, and inline duct fans. - APPLICATION & BENEFIT – Perfect for HVAC tools and projects, bathroom extractor fans, kitchen range hoods, tumble dryers, and ventilation systems in homes, garages, and workshops. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09PLLPR73 | | Best Sellers Rank | #80,984 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #147 in HVAC Ducting | | Brand | Repa Market | | Brand Name | Repa Market | | Color | Silver | | Connector Type | Reducer | | Customer Reviews | 4.6 out of 5 stars 1,044 Reviews | | Exterior Finish | Alloy Steel | | Global Trade Identification Number | 04751038502429 | | Included Components | Galvanized Steel Reducer/Increaser | | Item Dimensions | 7.99 x 5.35 x 7.99 inches | | Item dimensions L x W x H | 7.99 x 5.35 x 7.99 inches | | Manufacturer | Repa Market | | Material | Metal | | Material Type | Metal | | Number of Pieces | 1 | | Size | 4 to 8 Inch / 100 to 200 mm | | Thread Size | 6 inch | | Thread Type | NPT | | Unit Count | 1 Count | ## Images ![Repa Market 8" to 4" Inch Duct Reducer/Increaser – Galvanized Steel Vent Pipe Adapter HVAC & Dryer Vent Systems – Round Metal Coupling Connector for Exhaust Fans, Bathroom Ventilation, Kitchen Hoods - Image 1](https://m.media-amazon.com/images/I/81qzSV3WW8L.jpg) ![Repa Market 8" to 4" Inch Duct Reducer/Increaser – Galvanized Steel Vent Pipe Adapter HVAC & Dryer Vent Systems – Round Metal Coupling Connector for Exhaust Fans, Bathroom Ventilation, Kitchen Hoods - Image 2](https://m.media-amazon.com/images/I/714ey+QwzpL.jpg) ![Repa Market 8" to 4" Inch Duct Reducer/Increaser – Galvanized Steel Vent Pipe Adapter HVAC & Dryer Vent Systems – Round Metal Coupling Connector for Exhaust Fans, Bathroom Ventilation, Kitchen Hoods - Image 3](https://m.media-amazon.com/images/I/81w6YSILurL.jpg) ![Repa Market 8" to 4" Inch Duct Reducer/Increaser – Galvanized Steel Vent Pipe Adapter HVAC & Dryer Vent Systems – Round Metal Coupling Connector for Exhaust Fans, Bathroom Ventilation, Kitchen Hoods - Image 4](https://m.media-amazon.com/images/I/81TDxKDA4OL.jpg) ![Repa Market 8" to 4" Inch Duct Reducer/Increaser – Galvanized Steel Vent Pipe Adapter HVAC & Dryer Vent Systems – Round Metal Coupling Connector for Exhaust Fans, Bathroom Ventilation, Kitchen Hoods - Image 5](https://m.media-amazon.com/images/I/81XzMsqRdML.jpg) ## Available Options This product comes in different **Material Type, Size** options. ## Questions & Answers **Q: will this work for a bathroom fan duct that I need to decrease from 4" - 3" to fit in an eave vent? some people say that the reducer is the same size** A: It may work in an eave vent. I used it right off the ceiling vent fan. The exhaust duct on the old fan was 3 inch and the fan vent opening on the new fan was 4 inch. Aluminum taped inside and outside, then double wrapped the ducting. As strong as the reducer is, it would be difficult to reduce the length **Q: What's the temperature rating on this reducer?** A: Its galvanized steel! Unless you r looking for industrial stuff, the temp rate must be way above what you need; if you looking for industrial, steer clear! **Q: Can you clamp this to a 4 inch dryer vent? not the hose side** A: You need a duct splitter probably.. I don't really know what you're trying to do **Q: Will this work for a portable electric dryer?** A: I used it to vent a free-standing a/c unit. I did not have a window and drilled a hole in the wall and used this to vent it. I would think it would work for your dryer. ## Frequently Bought Together - 8" to 4" Inch / 200 to 100 mm Round Galvanized Steel Duct Reducer - Duct Fitting - Pipe Increaser Reducer - Metal Tube Reducing Coupling for Drain, Waste and Ventilation (8 to 4 Inch) - RENKE - Pack of 4 Large Adjustable 304 Stainless Steel Hose Clamps (91-114mm) for HVAC, Passive Vents, and Air Conditioning Systems,Hose Clips,Hose clamp,Pipe Clips,Hose Clamps,Large Clamps --- ## 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.ro/products/430313868-repa-market-8-to-4-inch-duct-reducer-increaser-galvanized](https://www.desertcart.ro/products/430313868-repa-market-8-to-4-inch-duct-reducer-increaser-galvanized) --- *Product available on Desertcart Romania* *Store origin: RO* *Last updated: 2026-10-12*