--- product_id: 531396534 title: "AC Infinity Automatic Duct Fan 4\", Inline Fan with Differential Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems" brand: "ac infinity" price: "₩301689" currency: KRW in_stock: true reviews_count: 13 category: "Ac Infinity" url: https://www.desertcart.kr/products/531396534-ac-infinity-automatic-duct-fan-4-inline-fan-with-differential store_origin: KR region: South Korea --- # 230 CFM airflow Auto pressure-activated 60 dBA noise level AC Infinity Automatic Duct Fan 4", Inline Fan with Differential Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems **Brand:** ac infinity **Price:** ₩301689 **Availability:** ✅ In Stock ## Summary > 💨 Elevate your airflow game—smart, silent, and seamless ventilation. ## Quick Answers - **What is this?** AC Infinity Automatic Duct Fan 4", Inline Fan with Differential Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems by ac infinity - **How much does it cost?** ₩301689 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/531396534-ac-infinity-automatic-duct-fan-4-inline-fan-with-differential) ## 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 - • **Energy-Smart Design:** Low 31.44W power draw with high static pressure for efficient HVAC support. - • **Effortless Airflow Boost:** Automatically activates with pressure sensing—no manual switches needed. - • **Omnidirectional Mounting:** Install vertically, horizontally, or diagonally for ultimate ducting flexibility. - • **Whisper-Quiet Performance:** Advanced EC motor keeps noise at a discreet 60 dBA—work or relax undisturbed. - • **Precision Ventilation Control:** Five PWM-controlled fan speeds for tailored airflow in any space. ## Overview The AC Infinity Automatic Duct Fan 4" is a high-performance inline booster fan designed to enhance airflow in extended or complex duct systems. Featuring a differential pressure switch, it automatically activates based on duct pressure changes, eliminating manual controls. With five PWM-controlled speeds powered by an energy-efficient EC motor, it delivers up to 230 CFM airflow quietly at 60 dBA. Its versatile mounting options and durable metal construction make it ideal for both residential and industrial HVAC applications. ## Description Product DescriptionAn automatic booster fan designed to improve airflow delivery in longer ductwork for more effective heating or cooling in home or industrial settings. Features a highly intuitive differential pressure switch that senses changes in your ducting to automatically operate its on/off activation. It also allows for mounting in any direction, making it possible to direct airflow vertically, horizontally, or diagonally. The inline duct fan also features five speeds powered by PWM controls that can generate precise airflow levels. This, combined with its flexibility in installation, provides total ventilation control in extended ducting and other difficult-to-reach spaces.Automatic Pressure SensingThe fan pressure switch delivers automatic activation capabilities to boost your heating or cooling on-demand, eliminating the need for manual adjustments. This is achieved by detecting pressure change in your ducting and turning it on whenever your home appliance is on. The smart sensor also allows you to omnidirectionally mount the duct fan for enhanced airflow versatility in existing HVAC systems.Quiet and Energy Efficient DesignThe automatic duct fan features a next-gen EC motor that powers quiet and energy-efficient performance. This innovative motor is controlled with PWM technology to ensure smooth performance while minimizing heat and noise levels. Its mixed flow design gives this vent booster fan a high static pressure rating to enhance airflow in HVAC applications with restricted air movement. This includes industrial settings like manufacturing and processing plants, as well as home residential settings such as bathroom ventilation and central air and heating systems. ## Features - Inline duct fan for boosting airflow in ducting and vent systems to ensure heating or cooling delivery. - Automatically activates the ventilation fan by detecting pressure change to eliminate manual adjusting. - Differential pressure switch supports mounting in any position to improve directional airflow versatility. - Features five fan speed levels powered by the PWM-controlled EC motor for more precise ventilation. - Duct Size: 4” | Dim: 6.9 x 11.9 x 7.4 in. | Airflow: 230 CFM | Noise: 60 dBA | Bearings: Dual Ball ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0C2W14V6L | | Air Flow Capacity | 230 Cubic Feet Per Minute | | Best Sellers Rank | #151,746 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #465 in Household Ventilation Fans | | Blade Length | 4 Inches | | Brand | AC Infinity | | Brand Name | AC Infinity | | Collection Name | Home | | Color | Black | | Control Method | App | | Controller Type | Button Control | | Customer Reviews | 4.5 out of 5 stars 115 Reviews | | Electric Fan Design | Blower | | Electric fan design | Blower | | Global Trade Identification Number | 00819137023789 | | Included Components | Cord | | Item Dimensions D x W x H | 9.25"D x 11.88"W x 9.11"H | | Item Type Name | Duct Fan | | Item Weight | 2.27 Kilograms | | Material | Metal | | Model Name | Automatic Duct Fan 4" | | Model Number | AC-BFP4 | | Noise Level | 60 Decibels | | Number of Blades | 10 | | Number of Speeds | 5 | | Part Number | AC-BFP4 | | Product Dimensions | 9.25"D x 11.88"W x 9.11"H | | Recommended Uses For Product | Cooling, Exhausting | | Room Type | Bathroom | | Size | 4" | | Special Features | Pressure Switch | | Style | 10-Inch, Speed Controller | | UPC | 819137023789 | | Unit Count | 1.0 Count | | Voltage | 12 Volts | | Wattage | 31.44 watts | ## Product Details - **Brand:** AC Infinity - **Color:** Black - **Controller Type:** Button Control - **Electric fan design:** Blower - **Material:** Metal - **Product Dimensions:** 9.25"D x 11.88"W x 9.11"H - **Recommended Uses For Product:** Cooling, Exhausting - **Room Type:** Bathroom - **Special Feature:** Pressure Switch - **Style:** 10-Inch, Speed Controller ## Images ![AC Infinity Automatic Duct Fan 4", Inline Fan with Differential Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems - Image 1](https://m.media-amazon.com/images/I/51DcPrezDUL.jpg) ![AC Infinity Automatic Duct Fan 4", Inline Fan with Differential Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems - Image 2](https://m.media-amazon.com/images/I/71Rne3p3pgL.jpg) ![AC Infinity Automatic Duct Fan 4", Inline Fan with Differential Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems - Image 3](https://m.media-amazon.com/images/I/61jYMM1cRuL.jpg) ![AC Infinity Automatic Duct Fan 4", Inline Fan with Differential Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems - Image 4](https://m.media-amazon.com/images/I/6168TVhAvFL.jpg) ![AC Infinity Automatic Duct Fan 4", Inline Fan with Differential Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems - Image 5](https://m.media-amazon.com/images/I/71LAz3CXT2L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by A***T on December 23, 2025* ### ⭐⭐⭐⭐⭐ Review *by D***Y on November 26, 2025* ### ⭐⭐⭐⭐⭐ Review *by J***E on February 11, 2026* ## Frequently Bought Together - AC Infinity Automatic Duct Fan 4", Inline Fan with Differential Fan Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems - AC Infinity Duct Adapter, 6” to 4” Ducting Reducer Increaser Cone for Grow Tent Bathroom Kitchen Ventilation Systems - AC Infinity Flexible 4-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 25-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.kr/products/531396534-ac-infinity-automatic-duct-fan-4-inline-fan-with-differential](https://www.desertcart.kr/products/531396534-ac-infinity-automatic-duct-fan-4-inline-fan-with-differential) --- *Product available on Desertcart South Korea* *Store origin: KR* *Last updated: 2026-05-06*