---
product_id: 228868320
title: "CLOUDLINE S4, Quiet 100mm Inline Duct Fan with Speed Controller - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics, 4-Inch"
brand: "ac infinity"
price: "C$16612"
currency: NIO
in_stock: true
reviews_count: 13
category: "Ac Infinity"
url: https://www.desertcart.ni/products/228868320-cloudline-s4-quiet-100mm-inline-duct-fan-with-speed-controller
store_origin: NI
region: Nicaragua
---

# 21W energy efficient 28 dBA ultra-quiet 205 CFM airflow CLOUDLINE S4, Quiet 100mm Inline Duct Fan with Speed Controller - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics, 4-Inch

**Brand:** ac infinity
**Price:** C$16612
**Availability:** ✅ In Stock

## Summary

> 🌿 Elevate your airflow game—quiet, powerful, and built for pros who demand the best.

## Quick Answers

- **What is this?** CLOUDLINE S4, Quiet 100mm Inline Duct Fan with Speed Controller - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics, 4-Inch by ac infinity
- **How much does it cost?** C$16612 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/products/228868320-cloudline-s4-quiet-100mm-inline-duct-fan-with-speed-controller)

## 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

- • **Whisper-Quiet Operation:** At just 28 dBA, it keeps your space cool without the noise pollution.
- • **Energy-Smart Performance:** EC motor with mixed flow design maximizes airflow while minimizing power draw.
- • **Plug & Play Installation:** Comes with all mounting hardware and a UK-compatible Type-G power plug for hassle-free setup.
- • **Precision Airflow Control:** 8-speed PWM controller lets you dial in perfect ventilation for any environment.
- • **Versatile Ventilation Solution:** Ideal for grow tents, hydroponics, AV racks, or any heating/cooling boost needs.

## Overview

The AC Infinity CLOUDLINE S4 is a 4-inch inline duct fan delivering 205 CFM airflow with whisper-quiet 28 dBA noise levels. Featuring an 8-speed PWM controller and energy-efficient EC motor, it’s engineered for precise ventilation in grow tents, hydroponics, AV racks, and more. Complete with UK Type-G plug and mounting kit, it offers professional-grade performance and easy installation.

## Description

AC Infinity CLOUDLINE S4, Quiet 100mm Inline Duct Fan with Speed Controller - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics, 4-Inch : desertcart.co.uk: DIY & Tools

Review: Quality product. - Quality product. Does the job it's meant to very nicely
Review: Quite and the remote control is really excellent. - I replaced a built in fan in my kitchen extractor unit (failed motor) by mounting this unit in-line in the extract duct. The remote lead was long enough for me to mount the remote in my old unit and yet have the fan mounted well away. I mounted the fan on wires thus reducing any transmitted running noise (I would not expect much anyway as such a smooth running motor). The level of extraction is variable and perfect for the application. Excellent product 10/10. Fully recommend.

## 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
- This product is equipped with a Type-G power plug and is compatible with the voltage commonly used in the United Kingdom.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07JB292JC |
| Best Sellers Rank | 8,394 in Garden ( See Top 100 in Garden ) 3 in Hydroponic Ventilation Equipment |
| Brand | AC Infinity |
| Colour | Pro Speed Controller |
| Customer Reviews | 4.7 4.7 out of 5 stars (11,468) |
| Date First Available | 21 Nov. 2018 |
| Energy Efficiency Class | A+ to G |
| Item Weight | 2.56 kg |
| Model Number | AI-CLS4 |
| Noise Level | 28 Decibels |
| Power / Wattage | 21 watts |
| Product Dimensions | 9 x 19 x 30 cm; 2.56 kg |
| Special Features | High Velocity, Waterproof |
| Voltage | 240 Volts |

## Product Details

- **Brand:** AC Infinity
- **Colour:** Pro Speed Controller
- **Electric fan design:** Exhaust Fan
- **Mounting type:** Wall Mount/Ceiling Mount
- **Power source:** Power Adapter
- **Product dimensions:** 17.5D x 18.8W x 30.2H centimetres
- **Recommended uses for product:** Air Circulation, Cooling, Exhausting
- **Room type:** Kitchen
- **Special feature:** High Velocity, Waterproof
- **Style:** Industrial

## Images

![CLOUDLINE S4, Quiet 100mm Inline Duct Fan with Speed Controller - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics, 4-Inch - Image 1](https://m.media-amazon.com/images/I/616TVs-68xL.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

### ⭐⭐⭐⭐⭐ Quality product.
*by C***G on 1 September 2025*

Quality product. Does the job it's meant to very nicely

### ⭐⭐⭐⭐⭐ Quite and the remote control is really excellent.
*by A***R on 21 March 2022*

I replaced a built in fan in my kitchen extractor unit (failed motor) by mounting this unit in-line in the extract duct. The remote lead was long enough for me to mount the remote in my old unit and yet have the fan mounted well away. I mounted the fan on wires thus reducing any transmitted running noise (I would not expect much anyway as such a smooth running motor). The level of extraction is variable and perfect for the application. Excellent product 10/10. Fully recommend.

### ⭐⭐⭐⭐⭐ Brilliant
*by C***R on 7 February 2021*

For me the ac infinity fans were a game changer, got my environment dialled in just how I need it and with ease to, I purchased an s6 and a t4 reasonably priced I might add, they work perfectly together! These fans are great quality and I was even more pleased when they already came with a connector attached to a U.K. plug! Overall 10 out of 10 for these fans, hats off to AC infinity, they’re so quiet and just a quality product, I will never use another make again, if you’re thinking about buying one just do it, you will not be disappointed

## 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 Nicaragua*
*Store origin: NI*
*Last updated: 2026-01-28*