--- product_id: 185719628 title: "Duct Adapter, 6” to 4” Ducting Reducer Increaser Cone | Designed for Grow Tents, Bathroom, Kitchen, or Ventilation Systems" brand: "ac infinity" price: "€ 76.57" currency: EUR in_stock: true reviews_count: 13 category: "Ac Infinity" url: https://www.desertcart.gr/products/185719628-duct-adapter-6-to-4-ducting-reducer-increaser-cone-designed store_origin: GR region: Greece --- # 6" to 4" duct size adapter High-temp corrosion resistance Galvanized steel with zinc coating Duct Adapter, 6” to 4” Ducting Reducer Increaser Cone | Designed for Grow Tents, Bathroom, Kitchen, or Ventilation Systems **Brand:** ac infinity **Price:** € 76.57 **Availability:** ✅ In Stock ## Summary > 🔧 Upgrade your airflow game with the ultimate duct adapter — because efficiency never goes out of style! ## Quick Answers - **What is this?** Duct Adapter, 6” to 4” Ducting Reducer Increaser Cone | Designed for Grow Tents, Bathroom, Kitchen, or Ventilation Systems by ac infinity - **How much does it cost?** € 76.57 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/185719628-duct-adapter-6-to-4-ducting-reducer-increaser-cone-designed) ## Best For - ac infinity enthusiasts ## Why This Product - Trusted ac infinity brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Precision Fit Design:** Raised lips on the smaller end ensure a secure grip, preventing slippage and leaks. - • **Compact & Easy Installation:** At just over 5 inches long, it fits tight spaces and installs effortlessly for instant upgrades. - • **Seamless Airflow Connection:** Maintain peak ventilation efficiency by bridging different duct sizes without airflow loss. - • **Versatile HVAC Compatibility:** Perfect for bathroom fans, dust collectors, grow tents, and kitchen ventilation systems. - • **Rugged Galvanized Steel Build:** Durable zinc-coated steel resists corrosion and withstands high temperatures for long-lasting performance. ## Overview The AC Infinity Duct Adapter is a premium 6" to 4" galvanized steel reducer designed to optimize airflow connections in HVAC systems. Featuring a corrosion-resistant zinc coating and raised lips for secure duct grip, it ensures durable, high-temperature performance across bathroom fans, dust collectors, grow tents, and more. Compact and easy to install, it’s the smart choice for professionals seeking reliable ventilation upgrades. ## Description A ducting cone designed for adapting ductwork to equipment like bathroom fans and dust collectors. Maintains airflow efficiency by creating a seamless connection between two different sized duct openings. Raised lips on the smaller opening for extra grip on ducting or your equipment’s duct opening. Galvanized steel body that is corrosion-resistant and can withstand high temperatures. Adapts 6 inches to 4 inches | Product Length: 5.11 inches | Finish: Zinc Coating Product Description A ventilation ducting tool designed to fit different-sized duct hole openings together, connecting smaller ducting to bigger fans and vice versa. Using this duct adapter to connect your ventilation fans to your ducting will help retain your system’s CFM efficiency. It features a raised lip on the reducer end to provide extra grip on ducting or duct openings, while the increaser end features a flat brim to achieve a flush fit. The galvanized steel body is finished with a zinc coating that aids in its resistance to corrosion and high temperatures. Applications The duct adapter is a versatile tool that can be retrofitted with a variety of different-sized ducting and fans. It is commonly paired with bathroom exhaust fans and dust collection units to adapt them to smaller ductwork as a reducer. Other adaptation projects include range hoods, tumble dryers, grow tent ventilation systems, and connecting smaller ducts to bigger ducts. Product Identification Manufacturer AC Infinity Inc. Product Name Duct Reducer 6" to 4" Adapter Product Model AC-SDR64 UPC Code 819137021334 Product and Mounting Dimensions Duct Opening Sizes 6" to 4" Product Length 5.11 in. (13.0 cm) Product Performance and Technical Specs Construction Galvanized Steel Color Metallic Silver Finish Zinc Coating Review: Bought for my GF... - Got this for my GF... Glowforge, not girlfriend. While it's not an exact tight fit with the tubing for the external fan (also bought separate) If you throw some tape on there it works great. And MUCH cheaper than those that are made specifically for the external fan. Review: Perfect fit for bathroom fan. - Perfect fit for bathroom fan. Slides right in. 6" to 4" Adapter. ## Features - A ducting cone designed for adapting ductwork to equipment like bathroom fans and dust collectors. - Maintains airflow efficiency by creating a connection between two different sized duct openings. - Raised lips on the smaller opening for extra grip on ducting or your equipment's duct opening. - Galvanized steel body that is corrosion-resistant and can withstand high temperatures. - Adapts 6 inches to 4 inches | Product Length: 5 inches | Finish: Zinc Coating ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0842XMBYC | | Best Sellers Rank | #34,408 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #49 in HVAC Ducting | | Brand | AC Infinity | | Brand Name | AC Infinity | | Color | Black | | Connector Type | Reducer | | Customer Reviews | 4.5 out of 5 stars 1,293 Reviews | | Exterior Finish | Zinc | | Item Highlight | Designed for Grow Tents, Bathroom, Kitchen, or Ventilation Systems | | Item Weight | 0.34 kg | | Manufacturer | AC Infinity | | Manufacturer Part Number | AC-SDR64 | | Material | Galvanized Steel | | Material Type | Galvanized Steel | | Model Number | AC-SDR64 | | Number of Packs | 1 | | Number of Pieces | 1 | | Size | 6" to 4" | | UPC | 819137021334 | | Unit Count | 1 Count | ## Product Details - **Brand:** AC Infinity - **Color:** Black - **Connector Type:** Reducer - **Exterior Finish:** Zinc - **Item Weight:** 0.34 kg - **Manufacturer:** AC Infinity - **Material:** Galvanized Steel - **Number of Packs:** 1 - **Number of Pieces:** 1 - **Size:** 6" to 4" ## Images ![Duct Adapter, 6” to 4” Ducting Reducer Increaser Cone | Designed for Grow Tents, Bathroom, Kitchen, or Ventilation Systems - Image 1](https://m.media-amazon.com/images/I/41SUtiulYQS.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Won't this hurt cfm's?** A: I used this for my smoker shed, so not sure about the cfm's **Q: How does this effect the rated CFM?** A: CFM is a measure of volume over time. Any time the output is restricted (say 6" down to 4") you can expect a back pressure and a REDUCTION in CFM, even if there is an increase in velocity (speed) of the airflow. Opening back up this restriction (4" up to 6") will not necessarily increase your CFM, it just decreases the velocity of the airflow and is less restrictive. It is not possible to increase CFM in this manner, without the introduction of another fan beyond the initial restriction. **Q: can this be used for stove piping? what is the gauge of the metal?** A: No it's not stove pipe **Q: Is this a solid 1 piece Construction?** A: Yes. Very solid and sturdy. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Bought for my GF... *by K***N on August 1, 2022* Got this for my GF... Glowforge, not girlfriend. While it's not an exact tight fit with the tubing for the external fan (also bought separate) If you throw some tape on there it works great. And MUCH cheaper than those that are made specifically for the external fan. ### ⭐⭐⭐⭐⭐ Perfect fit for bathroom fan. *by A***R on February 24, 2026* Perfect fit for bathroom fan. Slides right in. 6" to 4" Adapter. ### ⭐⭐⭐⭐⭐ Works great *by A***S on July 8, 2026* I recently bought a 14000 btu portland AC and the exhaust hose was too large for the vent hood built into my wall. This reducer was the perfect answer to my issue. ## Frequently Bought Together - AC Infinity Duct Adapter, 6” to 4” Ducting Reducer Increaser Cone for Grow Tent Bathroom Kitchen Ventilation Systems - AC Infinity CLOUDLINE PRO S6, Quiet 6” Inline Duct Fan with Speed Controller - EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics --- ## 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.gr/products/185719628-duct-adapter-6-to-4-ducting-reducer-increaser-cone-designed](https://www.desertcart.gr/products/185719628-duct-adapter-6-to-4-ducting-reducer-increaser-cone-designed) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-09-05*