---
product_id: 468244427
title: "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: "€ 261.90"
currency: EUR
in_stock: true
reviews_count: 6
category: "Ac Infinity"
url: https://www.desertcart.nl/products/468244427-cloudline-s4-4-inline-duct-fan-quiet-and-energy-efficient
store_origin: NL
region: Netherlands
---

# 24W energy efficient 28 dBA ultra-quiet 205 CFM airflow 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:** € 261.90
**Availability:** ✅ In Stock

## Summary

> 🌿 Quiet power that keeps your space fresh and your gear cool—because silence is the new luxury.

## Quick Answers

- **What is this?** 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?** € 261.90 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/468244427-cloudline-s4-4-inline-duct-fan-quiet-and-energy-efficient)

## 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

- • **Mixed-Flow EC Motor:** Advanced motor design delivers high static pressure with minimal noise and heat
- • **Versatile Compatibility:** Perfect for grow tents, AV racks, desktops, and laptops—integrates seamlessly with smart controllers
- • **Complete Installation Kit:** Includes power adapter, mounting hardware, and manual for effortless setup
- • **Durable Dual Ball Bearings:** 67,000-hour rated bearings ensure long-lasting, maintenance-friendly performance
- • **Precision PWM Speed Control:** 8-speed manual controller for tailored airflow and whisper-quiet operation

## Overview

The AC Infinity CLOUDLINE S4 is a 4-inch inline duct fan engineered for ultra-quiet, energy-efficient ventilation. Delivering 205 CFM airflow at just 28 dBA noise level, it features an 8-speed PWM-controlled EC motor with mixed-flow design and durable dual ball bearings rated for 67,000 hours. Ideal for grow tents, AV racks, and more, it comes with a full installation kit and integrates with smart controllers for precision environmental management.

## 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.
Review: パワー感は、どうかな？ と、いった感じです。

## 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 |
| Best Sellers Rank | #9,660 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #8 in Household Ventilation Fans |
| Customer Reviews | 4.7 4.7 out of 5 stars (9,587) |
| Date First Available | 21 November 2018 |
| Item model number | CLOUDLINE S4 |
| Manufacturer | AC Infinity |
| Material type | Tin, Pe |
| Part number | AI-CLS4 |
| Power source type | Power Adapter |
| Product Dimensions | 9 x 19 x 30 cm; 2.56 kg |

## Product Details

- **Brand:** AC Infinity
- **Colour:** Black
- **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

![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)

## 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.

### ⭐⭐⭐⭐ Review
*by D***N on 29 November 2021*

パワー感は、どうかな？ と、いった感じです。

### ⭐⭐⭐⭐⭐ Review
*by A***Z on 3 June 2020*

The brand is one of the better manufacturers selling to the general public and the vendor was very supportive and provided prompt service. I would buy from them again and recommend the inline fan without hesitation. It’s quiet at lower settings and works without issue.

## 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

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-01-28*