---
product_id: 538827349
title: "Automatic Duct Fan 4\", Inline Fan with Differential Fan Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems"
brand: "ac infinity"
price: "฿15145"
currency: THB
in_stock: true
url: https://www.desertcart.co.th/products/538827349-automatic-duct-fan-4-inline-fan-with-differential-fan-pressure
store_origin: TH
region: Thailand
---

# Auto-activation via pressure switch 5-speed PWM EC motor control 230 CFM airflow power Automatic Duct Fan 4", Inline Fan with Differential Fan Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems

**Brand:** ac infinity
**Price:** ฿15145
**Availability:** ✅ In Stock

## Summary

> 🌪️ Elevate your airflow game—smart, silent, and unstoppable!

## Quick Answers

- **What is this?** Automatic Duct Fan 4", Inline Fan with Differential Fan Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems by ac infinity
- **How much does it cost?** ฿15145 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/538827349-automatic-duct-fan-4-inline-fan-with-differential-fan-pressure)

## 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

- • **Durable & Compact:** Sleek 4-inch metal design with dual ball bearings ensures long-lasting, reliable performance.
- • **Quiet Yet Powerful:** Delivers robust 230 CFM airflow at a whisper-quiet 60 dBA—comfort without distraction.
- • **Versatile Installation:** Differential pressure switch supports any mounting position to optimize directional airflow.
- • **Effortless Airflow Boost:** Automatically activates with pressure changes—no manual tweaks needed.
- • **Precision Ventilation Control:** Five adjustable fan speeds powered by advanced PWM-controlled EC motor for tailored airflow.

## Overview

The AC Infinity Automatic Duct Fan 4" is a high-performance inline ventilation booster designed for industrial HVAC systems. Featuring a differential pressure switch for automatic activation, five-speed PWM-controlled EC motor for precise airflow management, and a compact 4-inch metal build, it delivers 230 CFM airflow quietly at 60 dBA. Its versatile mounting and durable dual ball bearings make it the go-to choice for efficient, hassle-free duct ventilation.

## Description

Automatic Duct Fan 4", Inline Fan with Differential Fan Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems

## 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 |
|---------------|-------|
| Brand | AC Infinity |
| Model Number | AC-BFP4 |
| Color | Black |
| Product Dimensions | 30.23 x 17.53 x 18.8 cm; 2.27 kg |
| Power / Wattage | 31.44 watts |
| Voltage | 12 Volts |
| Material | Metal |
| Number of Speeds | 5 |
| Noise Level | 60 dB |
| Compatible Models | Switch |
| Special Features | Pressure Switch |
| Item Weight | 2.27 Kilograms |

## Product Details

- **Product dimensions:** 30.2L x 18.8W x 17.5H centimeters
- **Brand:** AC Infinity
- **Power connector type:** 2-Pin
- **Voltage:** 12 Volts
- **Wattage:** 31.44 watts

## Images

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

## Available Options

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

## Frequently Bought Together

- AC Infinity Automatic Duct Fan 4", Inline Fan with Differential Fan Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems
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**Shop now:** [https://www.desertcart.co.th/products/538827349-automatic-duct-fan-4-inline-fan-with-differential-fan-pressure](https://www.desertcart.co.th/products/538827349-automatic-duct-fan-4-inline-fan-with-differential-fan-pressure)

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-04-25*