---
product_id: 468244427
title: "AC Infinity CLOUDLINE S4, 4” Inline Duct Fan, Quiet & Energy Efficient, 205 CFM, 28 dBA, 24W, 11.9” x 6.9” x 9cm, Compatible with Grow Tents, AV Racks, Desktops & Laptops"
brand: "ac infinity"
price: "€ 328.34"
currency: EUR
in_stock: true
reviews_count: 1
url: https://www.desertcart.it/products/468244427-ac-infinity-cloudline-s4-4-inline-duct-fan-quiet-energy
store_origin: IT
region: Italy
---

# 24W energy efficient 205 CFM airflow 28 dBA ultra-quiet AC Infinity CLOUDLINE S4, 4” Inline Duct Fan, Quiet & Energy Efficient, 205 CFM, 28 dBA, 24W, 11.9” x 6.9” x 9cm, Compatible with Grow Tents, AV Racks, Desktops & Laptops

**Brand:** ac infinity
**Price:** € 328.34
**Availability:** ✅ In Stock

## Summary

> 💨 Quietly dominate your airflow game with CLOUDLINE S4—where power meets stealth.

## Quick Answers

- **What is this?** AC Infinity CLOUDLINE S4, 4” Inline Duct Fan, Quiet & Energy Efficient, 205 CFM, 28 dBA, 24W, 11.9” x 6.9” x 9cm, Compatible with Grow Tents, AV Racks, Desktops & Laptops by ac infinity
- **How much does it cost?** € 328.34 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/468244427-ac-infinity-cloudline-s4-4-inline-duct-fan-quiet-energy)

## 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

- • **Built to Last:** Dual ball bearings rated for 67,000 hours ensure relentless performance and durability.
- • **Versatile Mounting:** Compact 4” duct size with wall or ceiling mount options fits seamlessly into grow tents, AV racks, or desktops.
- • **Whisper-Quiet Power:** Experience powerful airflow at just 28 dBA—your secret weapon for stealthy ventilation.
- • **Precision Speed Control:** 8-speed PWM controller lets you tailor airflow perfectly to your environment without noise spikes.
- • **Smart Integration Ready:** Compatible with CLOUDLINE T4 smart controller for next-level automated climate management.

## Overview

The AC Infinity CLOUDLINE S4 is a 4-inch inline duct fan delivering 205 CFM airflow at an ultra-quiet 28 dBA noise level. Featuring an energy-efficient 24W EC-motor with PWM speed control, it offers 8 adjustable speeds for precise ventilation. Designed with durable dual ball bearings and IP44-rated protection, it’s perfect for grow tents, AV racks, and indoor cooling applications. The fan’s modular design allows easy maintenance and smart controller compatibility for seamless environmental automation.

## Description

Inline Duct FanThe 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. Contains a mixed-flow design and EC-motor for a quiet and high static-pressure performance. The motor box containing the fan's impeller and blades can be detached for easy cleaning and maintenance. Complete kit includes one duct fan unit, one inline speed controller, installation manual, all necessary mounting hardware, and a corded AC plug adapter (UK 3-pin 220-240V AC Wall Plug - Type G) to power the unit through a standard outlet. This product is a part of the UIS platform of grow devices and smart controllers, designed to integrate with each other to achieve your ideal environment.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 suppress voltage to control fan speeds, this fan features an EC-motor that is precisely controlled using PWM (Pulse Width Modulation). This technology enables the fan's motor to run smoothly at low RPM speeds without generating motor noises and heat. Eight-speed options are available with a power switch, and backup memory. This S4 model can be connected to the CLOUDLINE T4 smart controller to share the same programming and power source.Quiet and Energy Efficient DesignThe inline fan features a mixed flow design using a stator blade and dual hydrodynamic wind circles. This gives it a high static pressure rating 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.

Review: Good quality. Very quiet. - Good quality. Very quiet. Using for 1.5 years. Excellent quality

## Features

- Designed to ventilate grow tents, transfer heating/cooling to rooms, circulate air, exhaust odors, and cool AV racks.
- 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07JB292JC |
| Air Flow Capacity | 205 Cubic Feet Per Minute |
| Best Sellers Rank | #37,165 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #60 in Household Ventilation Fans |
| Blade Length | 7.4 Inches |
| Blade Material | Plastic |
| Brand | AC Infinity |
| Brand Name | AC Infinity |
| Color | blackone |
| Colour | blackone |
| Control Method | Push Button |
| Controller Type | Button Control |
| Customer Reviews | 4.7 out of 5 stars 9,777 Reviews |
| Electric Fan Design | Exhaust Fan |
| Electric fan design | Exhaust Fan |
| Finish Type | Powder Coated |
| Global Trade Identification Number | 00819137020290 |
| Included Components | Cord |
| Indoor Outdoor Usage | Indoor |
| Is Product Cordless | No |
| Item Dimensions D x W x H | 17.6D x 30.3W x 18.8H centimeters |
| Item Weight | 2.61 Kilograms |
| Manufacturer | AC Infinity |
| Material | Tin, Pe |
| Model Name | CLOUDLINE S4 |
| Model Number | CLOUDLINE S4 |
| Mounting Type | Wall Mount/Ceiling Mount |
| Noise Level | 28 Decibels |
| Number of Blades | 10 |
| Number of Power Levels | 10 |
| Number of Speeds | 8 |
| Power Source | Power Adapter |
| Power source | Power Adapter |
| Product dimensions | 17.6D x 30.3W x 18.8H centimeters |
| Recommended Uses For Product | Cooling |
| Room Type | Kitchen |
| Special Features | High Velocity, Waterproof |
| Speed | 2800 RPM |
| Standby Power Shutoff | Alta eficiência |
| Style | Industrial |
| UPC | 819137020290 |
| Unit Count | 1 Count |
| Voltage | 240 Volts |
| Wattage | 21 watts |

## Product Details

- **Brand:** AC Infinity
- **Colour:** blackone
- **Electric fan design:** Exhaust Fan
- **Mounting type:** Wall Mount/Ceiling Mount
- **Power source:** Power Adapter
- **Product dimensions:** 17.6D x 30.3W x 18.8H centimeters
- **Recommended uses for product:** Cooling
- **Room type:** Kitchen
- **Special features:** High Velocity, Waterproof
- **Style:** Industrial

## Images

![AC Infinity CLOUDLINE S4, 4” Inline Duct Fan, Quiet & Energy Efficient, 205 CFM, 28 dBA, 24W, 11.9” x 6.9” x 9cm, Compatible with Grow Tents, AV Racks, Desktops & Laptops - Image 1](https://m.media-amazon.com/images/I/6117XGasixL.jpg)
![AC Infinity CLOUDLINE S4, 4” Inline Duct Fan, Quiet & Energy Efficient, 205 CFM, 28 dBA, 24W, 11.9” x 6.9” x 9cm, Compatible with Grow Tents, AV Racks, Desktops & Laptops - Image 2](https://m.media-amazon.com/images/I/61qh0zlE6ML.jpg)
![AC Infinity CLOUDLINE S4, 4” Inline Duct Fan, Quiet & Energy Efficient, 205 CFM, 28 dBA, 24W, 11.9” x 6.9” x 9cm, Compatible with Grow Tents, AV Racks, Desktops & Laptops - Image 3](https://m.media-amazon.com/images/I/61B4-3IcMGL.jpg)
![AC Infinity CLOUDLINE S4, 4” Inline Duct Fan, Quiet & Energy Efficient, 205 CFM, 28 dBA, 24W, 11.9” x 6.9” x 9cm, Compatible with Grow Tents, AV Racks, Desktops & Laptops - Image 4](https://m.media-amazon.com/images/I/61B8EwuR7nL.jpg)
![AC Infinity CLOUDLINE S4, 4” Inline Duct Fan, Quiet & Energy Efficient, 205 CFM, 28 dBA, 24W, 11.9” x 6.9” x 9cm, Compatible with Grow Tents, AV Racks, Desktops & Laptops - Image 5](https://m.media-amazon.com/images/I/71J9tAQeuEL.jpg)

## Available Options

This product comes in different **Material Type, Style** options.

## 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

### ⭐⭐⭐⭐⭐ Good quality. Very quiet.
*by C***D on 11 January 2025*

Good quality. Very quiet. Using for 1.5 years. Excellent quality

## 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.it/products/468244427-ac-infinity-cloudline-s4-4-inline-duct-fan-quiet-energy](https://www.desertcart.it/products/468244427-ac-infinity-cloudline-s4-4-inline-duct-fan-quiet-energy)

---

*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-03-22*