---
product_id: 6470798
title: "AC Infinity, MULTIFAN S4 Quiet USB Cooling Fan"
brand: "ac infinity"
price: "S$38"
currency: SGD
in_stock: null
url: https://www.desertcart.sg/products/6470798-ac-infinity-multifan-s4-quiet-usb-cooling-fan
store_origin: SG
region: Singapore
---

# 67,000 hrs dual-ball bearing lifespan 57 CFM airflow Ultra-quiet 18 dBA noise AC Infinity, MULTIFAN S4 Quiet USB Cooling Fan

**Brand:** ac infinity
**Price:** S$38
**Availability:** ❌ Out of Stock

## Summary

> 🖤 Stay cool, stay silent, stay ahead.

## Quick Answers

- **What is this?** AC Infinity, MULTIFAN S4 Quiet USB Cooling Fan by ac infinity
- **How much does it cost?** S$38 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/6470798-ac-infinity-multifan-s4-quiet-usb-cooling-fan)

## 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

- • **Plug & Play USB Power:** Effortless USB connectivity powers your fan from any AV or gaming device.
- • **Whisper-Quiet Cooling:** Keep your gear chill without the noise distraction.
- • **Precision Speed Control:** Customize airflow with a multi-speed controller for perfect balance.
- • **Durable Dual-Ball Bearings:** Engineered for longevity with 67,000 hours of reliable operation.
- • **Versatile Mounting Options:** Lay flat or stand upright to fit any setup seamlessly.

## Overview

The AC Infinity MULTIFAN S4 is a compact, UL-certified 140mm USB fan delivering 57 CFM airflow at an ultra-quiet 18 dBA noise level. Featuring a multi-speed controller and durable dual-ball bearings rated for 67,000 hours, it offers versatile mounting and easy USB power compatibility, making it the perfect cooling solution for gaming consoles, DVRs, and computer cabinets.

## Description

Full description not available

## Features

- Ultra-quiet UL-certified USB fan designed to cool various electronics and components.
- Features a multi-speed controller to set the fan’s speed to optimal noise and airflow levels.
- Dual-ball bearings have a lifespan of 67,000 hours and allows the fans to be laid flat or stand upright.
- USB plug can power the fan through USB ports found behind popular AV electronics and game consoles.
- Fan Size: 5.5 x 5.5 x 1 in. | Airflow: 57 CFM | Noise: 18 dBA | Bearings: Dual Ball

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Dimensions | 1"L x 5.5"W x 5.5"H |
| Brand | AC Infinity |
| Power Connector Type | 4-Pin |
| Voltage | 5 Volts |
| Wattage | 1.5 watts |
| Cooling Method | Air |
| Compatible Devices | Amplifier |
| Noise Level | 18 dB |
| Material | Rubber |
| Maximum Rotational Speed | 2000 RPM |
| Air Flow Capacity | 57 Cubic Feet Per Minute |
| UPC | 854759004365 |
| Global Trade Identification Number | 00854759004365 |
| Manufacturer | AC Infinity |
| Series | FBA_AI-MPF140A |
| Item model number | AI-MPF140A |
| Item Weight | 0.32 ounces |
| Item Dimensions  LxWxH | 1 x 5.5 x 5.5 inches |
| Color | Black |
| ASIN | B00MWH4FL4 |
| Is Discontinued By Manufacturer | No |
| Date First Available | October 18, 2013 |

## Product Details

- **Product Dimensions:** 1"L x 5.5"W x 5.5"H
- **Brand:** AC Infinity
- **Power Connector Type:** 4-Pin
- **Voltage:** 5 Volts
- **Wattage:** 1.5 watts
- **Cooling Method:** Air
- **Compatible Devices:** Amplifier
- **Noise Level:** 18 Decibels
- **Material:** Rubber
- **Maximum Rotational Speed:** 2000 RPM

## Images

![AC Infinity, MULTIFAN S4 Quiet USB Cooling Fan - Image 1](https://m.media-amazon.com/images/I/61prBJ2QyFL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: What is the rpm on these?**
A: I am not sure of the exact rpm.  I can tell you that I have 7 of these. 1 80mm, 4 120mm, 2 140 mm.  I use them on top of my receiver, under my laptop, router and on my nas. Very quiet while still pushing or pulling a good cfm number.  Sorry I do not know the exact rpm speed but if your looking at a home theatre application I think these will work great.  If you want cfm and some noise is OK you can probably do better.

**Q: How many watts does it consume?**
A: With the a/c adapter used, 1.8 watts. Used without the a/c adapter (as usb powered) .80 of a watt.

**Q: 14 months ago I purchased 3 140mm units for 24x7 usage; all 3 now fail to spin and just jiggle when plugged in.  Anyone else have high failure rate?**
A: Out of three 140mm and four 120mm units, that I own and have been running for approximately 24 months...  One failure.  Sent it back and got a replacement with no issues; blade broke.

**Q: I see the power cord has a usb connector on one side.  is the cord hard wired to the fan or is there a  connector? if a connector what type?**
A: It is a full powered USB port? Or does the fan speed switch also affect the power coming out of the USB female attached to the fan?

## Frequently Bought Together

- AC Infinity MULTIFAN S4, Quiet 140mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling
- AC Infinity Turbo Fan Power Adapter, for MULTIFAN Series USB Fans
- AC Infinity MULTIFAN S3, Quiet 120mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-01-26*