---
product_id: 531396534
title: "Automatic Duct Fan 4\", Inline Fan with Differential Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems"
brand: "ac infinity"
price: "€ 221.87"
currency: EUR
in_stock: true
reviews_count: 12
category: "Ac Infinity"
url: https://www.desertcart.es/products/531396534-automatic-duct-fan-4-inline-fan-with-differential-pressure-switch
store_origin: ES
region: Spain
---

# 230 CFM airflow Auto pressure-activated 60 dBA noise level Automatic Duct Fan 4", Inline Fan with Differential Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems

**Brand:** ac infinity
**Price:** € 221.87
**Availability:** ✅ In Stock

## Summary

> 💨 Elevate your airflow game—smart, silent, and seamless ventilation.

## Quick Answers

- **What is this?** Automatic Duct Fan 4", Inline Fan with Differential Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems by ac infinity
- **How much does it cost?** € 221.87 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/531396534-automatic-duct-fan-4-inline-fan-with-differential-pressure-switch)

## 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

- • **Energy-Smart Design:** Efficient 31.44W power consumption balances performance with sustainability.
- • **Effortless Airflow Boost:** Automatically activates with pressure sensing—no manual tweaks needed.
- • **Omnidirectional Mounting:** Install vertically, horizontally, or diagonally for ultimate airflow flexibility.
- • **Whisper-Quiet Performance:** Next-gen EC motor keeps noise at a discreet 60 dBA—work or relax undisturbed.
- • **Precision Ventilation Control:** Five PWM-controlled fan speeds for tailored airflow in any space.

## Overview

The AC Infinity Automatic Duct Fan 4" is a versatile inline booster fan designed to enhance airflow in HVAC duct systems. Featuring a differential pressure switch, it automatically activates based on duct pressure changes, eliminating manual operation. With five PWM-controlled speeds powered by an energy-efficient EC motor, it delivers up to 230 CFM airflow quietly at 60 dBA. Its omnidirectional mounting capability and durable metal build make it ideal for both residential and industrial ventilation challenges.

## Description

Product DescriptionAn automatic booster fan designed to improve airflow delivery in longer ductwork for more effective heating or cooling in home or industrial settings. Features a highly intuitive differential pressure switch that senses changes in your ducting to automatically operate its on/off activation. It also allows for mounting in any direction, making it possible to direct airflow vertically, horizontally, or diagonally. The inline duct fan also features five speeds powered by PWM controls that can generate precise airflow levels. This, combined with its flexibility in installation, provides total ventilation control in extended ducting and other difficult-to-reach spaces.Automatic Pressure SensingThe fan pressure switch delivers automatic activation capabilities to boost your heating or cooling on-demand, eliminating the need for manual adjustments. This is achieved by detecting pressure change in your ducting and turning it on whenever your home appliance is on. The smart sensor also allows you to omnidirectionally mount the duct fan for enhanced airflow versatility in existing HVAC systems.Quiet and Energy Efficient DesignThe automatic duct fan features a next-gen EC motor that powers quiet and energy-efficient performance. This innovative motor is controlled with PWM technology to ensure smooth performance while minimizing heat and noise levels. Its mixed flow design gives this vent booster fan a high static pressure rating to enhance airflow in HVAC applications with restricted air movement. This includes industrial settings like manufacturing and processing plants, as well as home residential settings such as bathroom ventilation and central air and heating systems.

Review: Very quiet, great air flow! - I needed to supplement my dryer vent, as my vent ran pretty long to the outside of my house. I installed this in the middle and it works great! It is pretty quiet and has enough air flow to do the job. The pressure switch works well and adds to the convenience. Installation is easy! I'm very happy!
Review: No more d80 code from LG Dryer. !!!! - Easy to install. Automatic turn on/off via pressure sensing is great. This allows me to installed it in the attic. My pipe run up 10' wall then turn 45 degree for 5' then run to the roof for another 4' or so. I guess this was too long for the new LG dryer because if keeps throwing the d80 code. The fan was installed on a 45 degree without any problem with the flexible hose + clamps. No mode d80 code from the LG dryer and the clothes dry so much faster.

## Features

- Inline duct fan for boosting airflow in ducting and vent systems to ensure heating or cooling delivery.
- Automatically activates the ventilation fan by detecting pressure change to eliminate manual adjusting.
- Differential pressure switch supports mounting in any position to improve directional airflow versatility.
- Features five fan speed levels powered by the PWM-controlled EC motor for more precise ventilation.
- Duct Size: 4” | Dim: 6.9 x 11.9 x 7.4 in. | Airflow: 230 CFM | Noise: 60 dBA | Bearings: Dual Ball

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C2W14V6L |
| Air Flow Capacity | 230 Cubic Feet Per Minute |
| Best Sellers Rank | #79,967 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #211 in Household Ventilation Fans |
| Brand | AC Infinity |
| Compatible Devices | Transmission Coolers |
| Cooling Method | Air |
| Date First Available | April 18, 2023 |
| Global Trade Identification Number | 00819137023789 |
| Item Weight | 4.99 pounds |
| Item model number | AC-BFP4 |
| Manufacturer | AC Infinity |
| Material | Metal |
| Noise Level | 60 Decibels |
| Number of Items | 1 |
| Power Connector Type | 2-Pin |
| Product Dimensions | 11.9"L x 6.9"W x 7.4"H |
| UPC | 819137023789 |
| Voltage | 12 Volts |
| Wattage | 31.44 watts |

## Product Details

- **Air Flow Capacity:** 230 Cubic Feet Per Minute
- **Brand:** AC Infinity
- **Compatible Devices:** Transmission Coolers
- **Cooling Method:** Air
- **Material:** Metal
- **Noise Level:** 60 Decibels
- **Power Connector Type:** 2-Pin
- **Product Dimensions:** 11.9"L x 6.9"W x 7.4"H
- **Voltage:** 12 Volts
- **Wattage:** 31.44 watts

## Images

![Automatic Duct Fan 4", Inline Fan with Differential Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems - Image 1](https://m.media-amazon.com/images/I/51DcPrezDUL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Very quiet, great air flow!
*by D***Y on November 26, 2025*

I needed to supplement my dryer vent, as my vent ran pretty long to the outside of my house. I installed this in the middle and it works great! It is pretty quiet and has enough air flow to do the job. The pressure switch works well and adds to the convenience. Installation is easy! I'm very happy!

### ⭐⭐⭐⭐⭐ No more d80 code from LG Dryer. !!!!
*by A***T on December 23, 2025*

Easy to install. Automatic turn on/off via pressure sensing is great. This allows me to installed it in the attic. My pipe run up 10' wall then turn 45 degree for 5' then run to the roof for another 4' or so. I guess this was too long for the new LG dryer because if keeps throwing the d80 code. The fan was installed on a 45 degree without any problem with the flexible hose + clamps. No mode d80 code from the LG dryer and the clothes dry so much faster.

### ⭐⭐⭐⭐⭐ Perfect automatic dryer inline fan/booster
*by T***M on October 3, 2025*

Works great as a dryer vent booster. I relocated the dryer vent as the rear deck is now blocking it, vent hose now travels quite a bit of distance and a few sharp turns. My cloths are not getting dryed as before. Installed this inline fan. It turns on automatically when my dryer turns on. Then it turns off after a minute. I'm a bit concerned about it getting too hot. Been drying it in medium heat setting. Cloths are still getting very dry. Works perfectly.

## Frequently Bought Together

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*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-01-23*