---
product_id: 89275796
title: "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: "€ 252.40"
currency: EUR
in_stock: true
category: "Ac Infinity"
url: https://www.desertcart.be/products/89275796-cloudline-pro-s4-quiet-4-inline-duct-fan-with-speed
store_origin: BE
region: Belgium
---

# 21W energy-efficient EC motor 28 dBA ultra-quiet 205 CFM airflow 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:** € 252.40
**Availability:** ✅ In Stock

## Summary

> 🌿 Elevate your air game—quiet, smart, and powerful ventilation for the modern grower.

## Quick Answers

- **What is this?** 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?** € 252.40 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/89275796-cloudline-pro-s4-quiet-4-inline-duct-fan-with-speed)

## 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:** Durable polycarbonate housing with dual ball bearings ensures long-lasting, reliable performance.
- • **Whisper-Quiet Power:** Operates at a barely-there 28 dBA, perfect for focused work or stealthy grow rooms.
- • **Energy-Smart EC Motor:** PWM-controlled motor delivers max airflow with minimal power—eco-friendly and wallet-friendly.
- • **Precision Airflow Control:** 10-speed wired controller plus app compatibility lets you tailor ventilation like a pro.
- • **Versatile Mounting Options:** Fits horizontally or vertically in any setup, from hydroponics to AV racks.

## 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 levels. Featuring a PWM-controlled EC motor and a 10-speed wired controller compatible with smart apps, it offers precise airflow management for grow tents, hydroponics, and climate control. Its durable polycarbonate build and versatile mounting options make it a top choice for professionals seeking reliable, energy-efficient air circulation.

## Description

desertcart.com: 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 : Patio, Lawn & Garden

## 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 | #2,668 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1 in Hydroponic Ventilation Equipment |
| Blade Length | 7.4 Inches |
| Blade Material | Plastic |
| Brand Name | AC Infinity |
| Cable Length | 144 Inches |
| Collection Name | Channel Fans |
| Color | Pro Speed Controller for S4 |
| Control Method | App |
| Controller Type | Button Control,Remote Control,App Control |
| Customer Reviews | 4.7 4.7 out of 5 stars (4,229) |
| 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 | 6.9"D x 11.9"W x 7.4"H |
| Item Weight | 2.61 Kilograms |
| Material | Polycarbonate |
| Model Name | CLOUDLINE S4 |
| Model Number | AI-CLS4 |
| Motor Type | EC motor |
| Mounting Type | Downrod Mount |
| Noise Level | 28 Decibels |
| Number of Blades | 10 |
| Number of Power Levels | 10 |
| Number of Speeds | 8 |
| Part Number | AI-CLS4 |
| Power Source | AC |
| Recommended Uses For Product | Inline Duct Fan |
| Room Type | Indoor |
| Size | 4-Inch |
| Smart Home Compatibility | Smart Home Compatible |
| Special Features | Programmable |
| Speed | 2800 RPM |
| Standby Power Shutoff | High |
| Style | Cloudline S4 |
| UPC | 819137020290 |
| Unit Count | 1.0 Count |
| Voltage | 240 Volts (AC) |
| Wattage | 21 watts |

## Product Details

- **Brand:** AC Infinity
- **Color:** Pro Speed Controller for S4
- **Electric fan design:** Exhaust Fan
- **Mounting Type:** Downrod Mount
- **Power Source:** AC
- **Product Dimensions:** 6.9"D x 11.9"W x 7.4"H
- **Recommended Uses For Product:** Inline Duct Fan
- **Room Type:** Indoor
- **Special Feature:** Programmable
- **Style:** Cloudline S4

## Images

![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)

## Available Options

This product comes in different **Color, Size** 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...

## 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
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*Product available on Desertcart Belgium*
*Store origin: BE*
*Last updated: 2026-07-06*