--- product_id: 551898487 title: "AC Infinity CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan with Speed Controller – EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics" brand: "ac infinity" price: "2786 kr" currency: DKK in_stock: true reviews_count: 5 category: "Ac Infinity" url: https://www.desertcart.dk/products/551898487-ac-infinity-cloudline-pro-s4-quiet-4-inline-duct-fan store_origin: DK region: Denmark --- # 28 dBA ultra-quiet 8-speed PWM EC motor 205 CFM airflow AC Infinity CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan with Speed Controller – EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics **Brand:** ac infinity **Price:** 2786 kr **Availability:** ✅ In Stock ## Summary > 🌬️ Quiet power that keeps your space fresh and your vibe professional. ## Quick Answers - **What is this?** AC Infinity CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan with Speed Controller – EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics by ac infinity - **How much does it cost?** 2786 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/551898487-ac-infinity-cloudline-pro-s4-quiet-4-inline-duct-fan) ## 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 EC Motor:** PWM-controlled EC motor delivers high airflow with minimal energy use and heat generation. - • **Plug & Play Convenience:** Complete kit with wired controller, mounting hardware, and compatibility with smart UIS controllers for seamless integration. - • **Precision Airflow Control:** 8-speed PWM controller lets you dial in perfect ventilation with whisper-quiet efficiency. - • **Whisper-Quiet Performance:** At just 28 dBA, keep your environment calm and focused without sacrificing power. - • **Durable & Versatile Design:** Dual ball bearings rated for 67,000 hours and IP44 rating ensure long-lasting, reliable operation in any orientation. ## Overview The AC Infinity CLOUDLINE PRO S4 is a 4-inch inline duct fan engineered for high-efficiency ventilation with 205 CFM airflow and ultra-quiet 28 dBA noise level. Featuring an 8-speed PWM-controlled EC motor, it offers precise speed control and energy-efficient operation. Its mixed flow design and dual ball bearings ensure reliable performance even in high static pressure environments. Ideal for grow tents, AV racks, and HVAC applications, it includes a wired speed controller and mounting hardware for easy installation and smart system compatibility. ## Description Designed to quietly ventilate grow tents, transfer heating/cooling to rooms, circulate fresh air, and cool AV closets. Features an 8-speed manual controller utilizing PWM. See T-Series for temperature and humidity controls. Mixed flow design combined with a PWM-controlled EC-motor for a truly quiet and energy efficient performance. Kit also includes corded AC power adapter, installation manual, and all necessary mounting hardware. Duct Size: 4” | Dimensions: 6.9 x 11.9 x 7.4 in. | Airflow: 205 CFM | Noise: 28 dBA | Bearings: Dual Ball Product Description The duct fan system is designed to quietly cool AV equipment rooms and closets, and to ventilate various air circulation and exhaust projects. Features an inline speed controller utilizing PWM-technology. Containing an inline mixed-flow design, the duct fan can maintain airflow even in high static pressure applications. Contains an EC-motor for a quiet and energy efficient performance. The motor box containing the fan’s impeller and blades can be detached from the mounted frame for easy cleaning and maintenance. Complete kit includes one duct fan unit, one inline speed controller, installation manual, and all necessary mounting hardware. Precise Speed Controller The inline speed controller enables you to set the duct fan’s speed to optimal noise and airflow levels for various environments. Unlike common AC-powered duct fans that suppresses voltage to control fan speeds, this duct fan features an EC-motor that is precisely controlled using PWM (Pulse Width Modulation). This technology enables the fan's motor to be able to run smoothly at extremely low RPM speeds without generating motor noises and heat as seen on variable voltage controllers. Eight speed options are available with power switch, and backup memory. This S4 model can be connected to the smart controller of the CLOUDLINE T4 to share the same programming and power source. Quiet and Energy Efficient Design The inline fan features a mixed flow design using a stator blade and dual hydrodynamic wind circles. This gives it a high static pressure rating, enabling it to deliver airflow even in applications where air movement is being restricted. The motor houses dual ball bearings rated at 67,000 hours which allows the duct fan unit to be mounted in any direction. The unit is IP44 rated to be highly resistant to dust and liquids, and performs well even in harsh environments. Applications This quiet duct fan system is popular in a variety of applications including cooling AV equipment rooms, closets, racks, and cabinets. Due to its low noise and advanced control features, it’s also used in various air circulation and ventilation projects including hydroponic grow rooms and tents, exhausting bathrooms and attics, and other installations. Product Identification Manufacturer AC Infinity Inc. Product Name CLOUDLINE S4 Product Model AI-CLS4 UPC Code 819137020290 Product and Mounting Dimensions - Fan Unit Duct Size 4" Total Dimensions 7.40 x 11.93 x 6.93 in. (18.8 x 30.3 x 17.6 cm) Mounting Hole-To-Hole Distance 3.15 x 2.36 in. (8.0 x 6.0 cm) Screw Hole Size Ø 0.197 in. (Ø 0.5 cm) Cord Length to Controller 240 in. (20 feet) Product and Mounting Dimensions - Controller Total Dimensions 3.34 x 2.95 x 0.51 in. (8.5 x 3.6 x 1.3 cm) Required Mounting Area 2.95 x 0.51 in. (3.6 x 1.3 cm) Hole to Hole Distance 2.87 in. (7.3 cm) Screw Hole Size Ø 0.157 in. (Ø 0.4 cm) Cord Length to Plug 96 in. (8 feet) Product Performance and Technical Specs Total Airflow 205 CFM Total Noise 28 dBA Max Speed 2800 RPM Static Pressure 223 Pa Voltage 100-240V AC Frequency 50/60Hz Max Power Draw 28 W Average Power Usage 21 W Current 1.2 A Power Connector Type US Plug (NEMA 1-15 Type-A) Operating Humidity 35 to 85% RH Operating Temperature 32 to 140°F Ingress Protection IP 44 Fan Bearings Dual Ball Mounting Positions Horizontal or Vertical L10 Life Expectancy 67,000 Hours CE Certification (Whole Product) PDF ETL Cert. (Whole Product) PDF RoHS Cert. (Whole Product) PDF SAA Cert. (Whole Product) PDF Product Manual Product Manual PDF Review: 静かですが - パワー感は、どうかな？ と、いった感じです。 Review: Good service and product ## Features - Designed to ventilate grow tents, transfer heating/cooling to rooms, circulate air, exhaust odors, and cool AV racks. - Features a wired 10-speed fan controller; also compatible with all UIS controllers with intelligent programming. - PWM-controlled EC motor provides quiet and energy-efficient performance with minimal heat and noise. - Mixed flow design with stator blade and hydrodynamic wind circles enables airflow delivery in high resistance areas. - Duct Size: 4” | Dimensions: 6.9 x 11.9 x 7.4 in. | Airflow: 205 CFM | Noise: 28 dBA | Bearings: Dual Ball ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07JB292JC | | Air Flow Capacity | 205 Cubic Feet Per Minute | | Best Sellers Rank | #117,854 in Garden & Outdoors ( See Top 100 in Garden & Outdoors ) #62 in Ventilation Equipment | | Blade Length | 7.4 Inches | | Blade Material | Plastic | | Brand | AC Infinity | | Brand Name | AC Infinity | | Cable Length | 144 Inches | | Collection Name | Channel Fans | | Colour | Pro Speed Controller | | Control Method | App | | Controller Type | Button Control,Remote Control,App Control | | Customer Reviews | 4.7 out of 5 stars 3,897 Reviews | | Electric Fan Design | Exhaust Fan | | Electric fan design | Exhaust Fan | | Finish Type | Matte | | Global Trade Identification Number | 00819137020290 | | Included Components | Cord, Remote | | Indoor Outdoor Usage | Indoor | | Installation Type | Versatile Mounting (Horizontal or Vertical) | | Is Product Cordless | No | | Item Dimensions D x W x H | 17.5D x 18.8W x 30.2H Centimeters | | Item Weight | 2.61 Kilograms | | Manufacturer | AC Infinity | | Material Type | Polycarbonate | | Model Name | CLOUDLINE S4 | | Model Number | CLOUDLINE S4 | | Motor Type | EC motor | | Mounting Type | Wall Mount/Ceiling Mount | | Noise Level | 28 Decibels | | Number Of Speeds | 8 | | Number of Blades | 10 | | Number of Power Levels | 10 | | Part Number | AI-CLS4 | | Power Source | Corded Electric | | Power Source Type | Corded Electric | | Product Dimensions | 17.5D x 18.8W x 30.2H Centimeters | | Recommended Uses For Product | Air Circulation, Cooling | | Room Type | Kitchen | | Size | 4-Inch | | Special Features | Bladeless | | Speed | 2800 RPM | | Standby Power Shutoff | High | | Style | Modern | | Style Name | Modern | | Switch Type | Push Button | | UPC | 819137020290 | | Unit Count | 1.0 Count | | Voltage | 240 Volts | | Wattage | 21 Watts | ## Product Details - **Brand:** AC Infinity - **Colour:** Pro Speed Controller - **Electric fan design:** Exhaust Fan - **Mounting Type:** Wall Mount/Ceiling Mount - **Power Source:** Corded Electric - **Product Dimensions:** 17.5D x 18.8W x 30.2H Centimeters - **Recommended Uses For Product:** Air Circulation, Cooling - **Room Type:** Kitchen - **Special Feature:** Bladeless - **Style:** Modern ## Images ![AC Infinity CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan with Speed Controller – EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics - Image 1](https://m.media-amazon.com/images/I/6117XGasixL.jpg) ![AC Infinity CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan with Speed Controller – EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics - Image 2](https://m.media-amazon.com/images/I/61qh0zlE6ML.jpg) ![AC Infinity CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan with Speed Controller – EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics - Image 3](https://m.media-amazon.com/images/I/61B4-3IcMGL.jpg) ![AC Infinity CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan with Speed Controller – EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics - Image 4](https://m.media-amazon.com/images/I/61B8EwuR7nL.jpg) ![AC Infinity CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan with Speed Controller – EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics - Image 5](https://m.media-amazon.com/images/I/71J9tAQeuEL.jpg) ## Questions & Answers **Q: What is the max temp of use for this fan? i see you said 240f, but all other manufacturers with plastic impellers say max temp 140f. are you certain?** A: Always stay a minimum of 25% below specified temp. At minimum they can warp and and motor performance would be affected **Q: If powered from a switched outlet, will it remember the last speed setting or does that require constant power?** A: Morning RS, the S4 will not remember your fan speed. It’s a manual setting only. I also have a T4 with a smart controller and it does remember and can be set to auto for heat and humidity. The T4 is for auto exhaust and S4 is intake. If it is your only fan go with the T4. Also, if you have more than 200sf to ventilate go directly to the T6. The are very quiet which is important as my room is under a bedroom. Hope this helps. **Q: How well does this work with a carbon filter?** A: I have a 350 Cfm Coco/Carbon Fiber filter that I place on the Exit side of my application. I have tested the filter on both the intake and the exit. I found these units Push much better than they Pull. I do have to increase the power by 10% when I install the exit filter, but it's not really an issue in my application. **Q: What is the best way to connect this to 12 or 24 volt system?** A: AC infinity, also looking for DC system compatibility off grid use with solar and lithium battery banks. Want to avoid DC->AC->DC to save wattage. I like that your fan design is efficient, but not in my case as the conversion costs wattage/heat. Ended up buying Atwood unit which does 12/24v which is no where near as nice a fan as this... ## Customer Reviews ### ⭐⭐⭐⭐ 静かですが *by D***N on 29 November 2021* パワー感は、どうかな？ と、いった感じです。 ### ⭐⭐⭐⭐⭐ Good service and product *by U***H on 12 March 2026* ### ⭐⭐⭐⭐⭐ They care about every detail *by A***N on 7 December 2025* ## Frequently Bought Together - AC Infinity CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan with Speed Controller – EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics - AC Infinity Flexible 4-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 8-Feet Long for Heating Cooling Ventilation and Exhaust - 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.dk/products/551898487-ac-infinity-cloudline-pro-s4-quiet-4-inline-duct-fan](https://www.desertcart.dk/products/551898487-ac-infinity-cloudline-pro-s4-quiet-4-inline-duct-fan) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-04-25*