AC Infinity Duct Fan 4 Review: Boost Industrial Ventilation

This is my review of the AC Infinity Automatic Duct Fan 4, Inline Duct Booster 4 Inch with Differential Fan Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems. As someone who has struggled with maintaining the proper temperature in a room, this fan has been a lifesaver for me.

Pros and Cons

What We Liked

  1. The airflow produced by this fan is incredible. It has significantly improved the delivery of heating or cooling in my ducting system.
  2. The automatic activation feature is a game-changer. Instead of constantly adjusting the fan manually, it detects pressure changes and turns on/off accordingly.
  3. The differential pressure switch can be mounted in any position, providing versatility in directing airflow.
  4. The five fan speed levels, controlled by the PWM-controlled EC motor, allow for more precise ventilation.
  5. The fan is well-built and reliable, thanks to its dual ball bearings.

What Can Be Improved

  1. The pressure feature may not be necessary for everyone, so an option to disable it would be beneficial.
  2. The process of mounting the fan can be a bit inconvenient due to the need to partially disassemble it. A more user-friendly mounting system would be appreciated.

Quick Verdict

The AC Infinity Automatic Duct Fan 4 is a powerful and efficient fan that greatly improves the airflow in HVAC ducting systems. The automatic activation feature and differential pressure switch add convenience and flexibility. While the pressure feature may not be necessary for everyone, the overall performance and quality of this fan make it a worthwhile investment.

If you’re looking to enhance the functionality of your ventilation system, I highly recommend considering the AC Infinity Automatic Duct Fan 4. Check it out here.

Unboxing – What’s Inside?

As an HVAC professional in the USA, I recently purchased the AC Infinity Automatic Duct Fan 4 from Amazon to enhance the ventilation system in a client’s bathroom. I was pleasantly surprised by how quickly the product was delivered, arriving within just a few days.

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Upon unboxing the AC Infinity Automatic Duct Fan 4, I found the following items inside:

  • An empty box


Here are the specifications of the AC Infinity Automatic Duct Fan 4:

  • Noise Level: 60 dB
  • Number of Speeds: 5
  • Controller Type: Button Control
  • Recommended Uses For Product: Exhausting, Cooling
  • Special Feature: Pressure Switch
  • Room Type: Bathroom
  • Product Dimensions: 9.25D x 11.88W x 9.11H
  • Style: 10-Inch, Speed Controller
  • Color: Black
  • Brand: AC Infinity


The user guide for the AC Infinity Automatic Duct Fan 4 was unfortunately not included in the package. Although I was disappointed initially, I was able to find the user guide online at the product’s official website. The user guide provided detailed instructions on installation, wiring, and troubleshooting, which proved to be extremely helpful in setting up the fan correctly. You can find the user guide here.

Features – What We Found

Inline duct fan for boosting airflow in ducting and vent systems

The AC Infinity Automatic Duct Fan 4 is equipped with an inline duct fan that effectively boosts airflow in ducting and vent systems. This feature ensures that heating or cooling air is delivered efficiently to the desired areas, providing optimal temperature control. With this fan, you can enhance the performance of your HVAC system and improve the overall comfort of your space.

Pro-tip: When installing the AC Infinity Automatic Duct Fan 4, make sure to position it strategically in your ducting system to maximize the airflow. Consider placing the fan near the end of a long duct run or in areas where airflow may be restricted. This will help to evenly distribute air and improve ventilation.

Automatically activates the ventilation fan by detecting pressure change

The differential fan pressure switch included in the AC Infinity Automatic Duct Fan 4 ensures that the ventilation fan is automatically activated when it detects a change in pressure. This eliminates the need for manual adjustments and ensures a hassle-free operation. The switch is highly sensitive and quickly responds to pressure changes, providing seamless control over the fan operation.

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With the product_link, you can purchase the AC Infinity Automatic Duct Fan 4 on Amazon and experience the convenience of an automated ventilation system.

Differential pressure switch supports mounting in any position

The differential pressure switch of the AC Infinity Automatic Duct Fan 4 is designed to support mounting in any position, offering versatility in directional airflow. This means that you can install the fan in various orientations, depending on your specific needs and the layout of your ventilation system. The switch is adaptable, allowing you to optimize airflow and ensure that air is directed precisely where it is needed.

Five fan speed levels powered by the PWM-controlled EC motor

The AC Infinity Automatic Duct Fan 4 provides five fan speed levels, all powered by the PWM-controlled EC (electronically commutated) motor. This motor technology allows for more precise ventilation control, enabling you to adjust the fan speed to suit your specific requirements. Whether you need a gentle airflow or a more powerful ventilation, the fan speed can be tailored to meet your demands.

Pro-tip: Experiment with different fan speed settings to find the sweet spot for your HVAC system. Optimize the balance between airflow, noise level, and energy consumption for the most efficient and comfortable ventilation experience.

Duct Size: 4” | Dim: 6.9 x 11.9 x 7.4 in. | Airflow: 230 CFM | Noise: 60 dBA | Bearings: Dual Ball

The AC Infinity Automatic Duct Fan 4 is designed to fit ducts with a size of 4 inches. Its compact dimensions of 6.9 x 11.9 x 7.4 inches make it easy to install in various spaces. The fan delivers an airflow of 230 CFM (cubic feet per minute), ensuring efficient ventilation of your HVAC ducting system.

The noise level of the fan is measured at 60 dBA, providing a relatively quiet operation. The inclusion of dual ball bearings contributes to the fan’s durability, ensuring smooth and reliable performance over time.

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Overall, this feature-rich duct fan offers a combination of compact design, powerful airflow, and quiet operation, making it an excellent choice for HVAC ducting ventilation exhaust systems.

Review and Scores

Our Score: 93.0

I recently purchased the AC Infinity Automatic Duct Fan 4 and I have been extremely satisfied with its performance. As someone who values a comfortable sleeping temperature, this fan has been a life-altering addition to my home. It provides an incredible amount of airflow, effectively cooling my problem room which was previously 10 degrees warmer. The installation process was easy, and the fan operates quietly, ensuring a peaceful environment for sleep. I highly recommend this fan to anyone looking to improve the airflow in their home.

One of the standout features of this fan is its automatic activation system. It detects pressure changes and activates the ventilation fan accordingly, eliminating the need for manual adjusting. This is a convenient and time-saving feature that ensures optimal airflow at all times. Additionally, the differential pressure switch can be mounted in any position, allowing for improved directional airflow versatility.

The AC Infinity Automatic Duct Fan also offers five fan speed levels, powered by the PWM-controlled EC motor. This provides precise control over ventilation and allows for customization based on individual needs. The fan is solid and reliable, with dual ball bearings for durability. Its compact size and detailed manual make it an easy-to-use and versatile product for various ventilation needs.

I am thoroughly impressed with the AC Infinity Automatic Duct Fan 4. It has exceeded my expectations in terms of performance and convenience. Its ability to boost airflow in ducting and vent systems ensures the efficient delivery of heating or cooling. Whether you need to improve the comfort of a specific room or enhance the performance of your HVAC ducting ventilation system, this fan is a worthwhile investment. Experience the benefits of this top-quality product by purchasing it on Amazon.