---
product_id: 420829995
title: "AC Infinity CLOUDLINE A4, Quiet 4” Inline Duct Fan with Speed Controller"
brand: "ac infinity"
price: "S$402"
currency: SGD
in_stock: true
reviews_count: 5
category: "Ac Infinity"
url: https://www.desertcart.sg/products/420829995-ac-infinity-cloudline-a4-quiet-4-inline-duct-fan-speed
store_origin: SG
region: Singapore
---

# 165 CFM airflow - powerful ventilation 29 dBA noise - whisper-quiet operation 10-speed controller - precise airflow control AC Infinity CLOUDLINE A4, Quiet 4” Inline Duct Fan with Speed Controller

**Brand:** ac infinity
**Price:** S$402
**Availability:** ✅ In Stock

## Summary

> 💨 Quietly powerful airflow that keeps your space fresh and your vibe on point.

## Quick Answers

- **What is this?** AC Infinity CLOUDLINE A4, Quiet 4” Inline Duct Fan with Speed Controller by ac infinity
- **How much does it cost?** S$402 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/420829995-ac-infinity-cloudline-a4-quiet-4-inline-duct-fan-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

- • **Smart Compatibility:** Seamlessly integrates with CLOUDLINE smart controllers for automated climate management and next-level convenience.
- • **Whisper-Quiet Power:** Experience robust 165 CFM airflow with barely-there 29 dBA noise—perfect for focused workspaces and stealthy grow tents.
- • **Tailored Airflow Control:** 10-speed wired controller lets you dial in the exact ventilation level you need, balancing performance and silence effortlessly.
- • **Versatile & Sleek Design:** Compact 4” duct size fits tight spaces from AV closets to hydroponic tents, with IP44 rating for dust and moisture resistance.
- • **Durable & Low-Maintenance:** Dual ball bearings rated for 67,000 hours and detachable motor box ensure long-lasting, hassle-free operation.

## Overview

The AC Infinity CLOUDLINE A4 is a premium 4-inch inline duct fan delivering 165 CFM airflow at an ultra-quiet 29 dBA noise level. Featuring a 10-speed wired controller and EC motor technology, it offers precise, energy-efficient ventilation ideal for grow tents, AV closets, and indoor climate control. Built with durable dual ball bearings and IP44-rated housing, it ensures long-lasting, low-maintenance performance in demanding environments.

## Description

Designed to quietly ventilate grow tents, exhaust odors, transfer heating/cooling to rooms, and cool AV closets. Features the same build quality and innovations as the CLOUDLINE Series delivered in a value package. Includes a wired 10-speed fan controller; also compatible with all CLOUDLINE Series smart controllers. Mixed flow design combined with an EC-powered motor for a truly quiet and energy efficient performance. Duct Size: 4” | Dimensions: 6.9 x 11.9 x 7.4 in. | Airflow: 165 CFM | Noise: 29 dBA | Bearings: Dual Ball Product Description This inline fan system packs the CLOUDLINE’s core innovations and premium build quality together to bring you a value package. Designed to quietly cool grow tents, rooms, and closets, and provide ventilation in various air circulation and exhaust projects. Containing an inline mixed-flow design, the duct fan can maintain airflow even in high static pressure applications. 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 inline fan unit, one speed controller, UIS to 4-pin Molex dongle, installation manual, and all necessary mounting hardware. Precise Speed Controller The speed controller enables you to set the duct fan’s speed to optimal noise and airflow levels for various environments. This inline fan is equipped with the CLOUDLINE Series’ same EC-motor that is precisely controlled using PWM (Pulse Width Modulation), which enables it to run smoothly at extremely low RPM speeds without generating motor noise. Ten speed options are available with power switch and backup memory. This model can be connected to the following smart controllers to share the same programming and power source as other EC-motor CLOUDLINE fans: B-Series Temperature Controller T-Series Temperature and Humidity Controller CONTROLLER 67 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. In addition, the inline fan is crafted with a plastic mounting base to diminish noise as a result of fan vibration. The unit is IP44 rated to be highly resistant to dust and liquids and performs well even in harsh environments. Applications This quiet inline fan system is most found in hydroponic grow tents and rooms to provide cooling and ventilation for plants. Its low noise and advanced control features make it fit for bathroom and attic settings, as well as cooling AV equipment rooms, closets, racks, and cabinets. Product Identification Manufacturer AC Infinity Inc. Product Name CLOUDLINE A4 Product Model AI-CLA4 UPC Code 819137021747 Product and Mounting Dimensions - Fan Unit Duct Size 4" Total Dimensions 7.48 x 11.89 x 6.93 in. (19.0 x 30.2 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 72 in. (6 feet) Cord Length to Plug 72 in. (6 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) Product Performance and Technical Specs Total Airflow 165 CFM Total Noise 29 dBA Max Speed 2800 RPM Static Pressure 324 Pa Voltage 100-240V AC Frequency 50/60Hz Max Power Draw 25 W Average Power Usage 18 W Current 0.55 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 Fan Quality Approvals CE, RoHS CE Certification (Whole Product) PDF RoHS Cert. (Whole Product) PDF Product Manual Product Manual PDF

Review: Near silent and powerful - This fan is epic! Got it for a ventilation system for my 3D printers. And I had prior to this a smaller fan. But I didn’t like the hum of the PWM controller. So this fan with the 10 step speed controller makes it silent. The only noise you hear is from the wind it makes on higher speeds. I run it on #3 which would have to be like 7 on the old fan. I’m very pleased. Thanks for a great fan! Oh also the power cord and the remote cord is nice and long. I’m super thrilled!
Review: Richtig power - Sehr leistungsfähiger Lüfter hat ordentlich Power ich verstehe, viele Rezessionen nicht so Kunden sagen im gesamten ist es zu laut. Denn dieses System ist eher leise, wenn man es auf Stufe 2 stellt. Auf maximaler stufe, ist es laut ja aber man muss bedenken der Lüfter muss ordentlich Luft wegdrücken meinem Kumpel reichen 2 Stufen locker dabei wird auch viel Luft abtransportiert. Das Verbauen hat auch super geklappt und die Kabel waren mehr als nur lang genug, sodass man alles sorgfältig verlegen kann. Eine klare Kaufempfehlung.

## Features

- Designed to quietly ventilate grow tents, exhaust odors, transfer heating/cooling to rooms, and cool AV closets.
- Features the same build quality and innovations as the CLOUDLINE Series delivered in a value package.
- Includes a wired 10-speed fan controller; also compatible with all CLOUDLINE Series smart controllers.
- Mixed flow design combined with an EC-powered motor for a truly quiet and energy efficient performance.
- Duct Size: 4" | Dimensions: 6.9 x 11.9 x 7.4 in. | Airflow: 165 CFM | Noise: 29 dBA | Bearings: Dual Ball

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09FYK6Z3R |
| Air Flow Capacity | 165 Cubic Feet Per Minute |
| Best Sellers Rank | #114,455 in Garden & Outdoors ( See Top 100 in Garden & Outdoors ) #92 in Ventilation Equipment |
| Blade Length | 7.4 Inches |
| Blade Material | Plastic |
| Brand | AC Infinity |
| Brand Name | AC Infinity |
| Cable Length | 6 Feet |
| Collection Name | Inline Duct Fans |
| Colour | Black |
| Control Method | App |
| Controller Type | Button Control |
| Country of Origin | USA |
| Customer Reviews | 4.6 out of 5 stars 477 Reviews |
| Electric Fan Design | Exhaust Fan |
| Electric fan design | Exhaust Fan |
| Finish Type | Matte |
| Included Components | Cord, Remote |
| Indoor Outdoor Usage | Indoor |
| Installation Type | Mounted |
| Is Product Cordless | No |
| Item Dimensions D x W x H | 17.5D x 30.2W x 18.8H Centimeters |
| Manufacturer | ac |
| Material Type | Plastic |
| Model Name | CLOUDLINE LITE A4 |
| Model Number | AI-CLA4 |
| Motor Type | EC |
| Mounting Type | Window Mount |
| Noise Level | 29 Decibels |
| Number Of Speeds | 1 |
| Number of Blades | 10 |
| Number of Power Levels | 10 |
| Part Number | AI-CLA4 |
| Power Source | AC |
| Power Source Type | AC |
| Product Dimensions | 17.5D x 30.2W x 18.8H Centimeters |
| Recommended Uses For Product | Inline Duct Fan |
| Room Type | Kitchen |
| Size | 4-Inch |
| Special Features | High Velocity |
| Specification Met | CE, RoHS |
| Speed | 10 RPM |
| Standby Power Shutoff | High Efficiency |
| Style | Industrial |
| Style Name | Industrial |
| Switch Type | Push Button |
| UPC | 819137021747 |
| Unit Count | 1.0 Count |
| Voltage | 120 Volts |
| Wattage | 7.2 Watts |

## Product Details

- **Brand:** AC Infinity
- **Colour:** Black
- **Electric fan design:** Exhaust Fan
- **Mounting Type:** Window Mount
- **Power Source:** Corded Electric
- **Product Dimensions:** 17.5D x 30.2W x 18.8H Centimeters
- **Recommended Uses For Product:** Cooling, Exhausting
- **Room Type:** Kitchen
- **Special Feature:** High Velocity
- **Style:** Industrial

## Images

![AC Infinity CLOUDLINE A4, Quiet 4” Inline Duct Fan with Speed Controller - Image 1](https://m.media-amazon.com/images/I/51O8XVVM5tL.jpg)
![AC Infinity CLOUDLINE A4, Quiet 4” Inline Duct Fan with Speed Controller - Image 2](https://m.media-amazon.com/images/I/71Urj8OcJfL.jpg)
![AC Infinity CLOUDLINE A4, Quiet 4” Inline Duct Fan with Speed Controller - Image 3](https://m.media-amazon.com/images/I/516+O8jtltS.jpg)
![AC Infinity CLOUDLINE A4, Quiet 4” Inline Duct Fan with Speed Controller - Image 4](https://m.media-amazon.com/images/I/61rKoyKVGTS.jpg)
![AC Infinity CLOUDLINE A4, Quiet 4” Inline Duct Fan with Speed Controller - Image 5](https://m.media-amazon.com/images/I/71CDBlYtPJL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Near silent and powerful
*by J***S on 5 June 2026*

This fan is epic! Got it for a ventilation system for my 3D printers. And I had prior to this a smaller fan. But I didn’t like the hum of the PWM controller. So this fan with the 10 step speed controller makes it silent. The only noise you hear is from the wind it makes on higher speeds. I run it on #3 which would have to be like 7 on the old fan. I’m very pleased. Thanks for a great fan! Oh also the power cord and the remote cord is nice and long. I’m super thrilled!

### ⭐⭐⭐⭐⭐ Richtig power
*by M***S on 16 June 2025*

Sehr leistungsfähiger Lüfter hat ordentlich Power ich verstehe, viele Rezessionen nicht so Kunden sagen im gesamten ist es zu laut. Denn dieses System ist eher leise, wenn man es auf Stufe 2 stellt. Auf maximaler stufe, ist es laut ja aber man muss bedenken der Lüfter muss ordentlich Luft wegdrücken meinem Kumpel reichen 2 Stufen locker dabei wird auch viel Luft abtransportiert. Das Verbauen hat auch super geklappt und die Kabel waren mehr als nur lang genug, sodass man alles sorgfältig verlegen kann. Eine klare Kaufempfehlung.

### ⭐⭐⭐⭐⭐ excellent in-line fan
*by A***T on 29 June 2026*

all just started using it, but this looks an excellent piece of kit and gives good extraction from my airbrush booth despite resistance from filter and two right angle bends in extraction tube

## Frequently Bought Together

- AC Infinity CLOUDLINE A4, 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 Singapore*
*Store origin: SG*
*Last updated: 2026-08-03*