Best Quietest 6 Inch Inline Fan

It is common for human beings to have a rough idea about a certain product and then go shopping. This does not always work out well since the salespeople, and the sales sites will bombard you with lots of information about products that seemingly look and function the same.

Anyone who has gone shopping for a six-inch inline fan can relate to this struggle. What happens is that at the end of the day, one may end up purchasing a 6-inch inline fan that is not suitable for their needs.

I understand this struggle, and that is why I have prepared this guide for the best and quietest 6-inch inline fans.

The Quietest 6 Inch Inline Fan Comparison Table

Why do I need a 6 Inch Inline Duct Fan?

It’s the information age, and I know that there are still some questions lingering in mind before making the final decision, even with these reviews.

Since I understand this feeling, below are some common and emerging questions after people read reviews of inline duct fans. I am sure that this buying guide will integral to your buying decision.

Assumptions may be sometimes misleading, and since I want all of us to start on the same page, I will not assume that everyone understands what inline duct fans are.

Inline fans are equipment for extraction and removal of moving air through a system. for the inline fan to function properly, it can be attached to the inside of a duct or installed directly inline. Inline fans are a vital component for any residential, commercial, or industrial space.

You need a 6-inch inline fan to facilitate proper air exchange in your spaces, whether they grow tents, bathrooms, or even commercial spaces. Without a six-inch inline fan, it is easy to get congestion and clogging of unnecessary elements in a room.

Consequently, the people in the room may develop allergies and even fall sick. Why fall sick or ignite an allergy when you can use a six-inch inline fan?

In grow tents where most people may use these fans, they help in keeping the plants alive. The lack of proper ventilation in any grow tent will lead to clogging of the leaves and eventual death of plants, which is a loss that you can avoid by procuring a 6-inch inline fan.

Difference Between a 6 Inch Inline Duct and a 4 Inch Inline Duct Fan

“The 4-inch inline duct fan is cheaper than the 6-inch inline duct fan. These two are just fans; they will work the same way, so there is no need of purchasing different fans”.

These are just but the few common statements among people shopping for fans without understanding the different inches. In understanding the difference, every space requires an inline fan, suitable for the size and circulation requirements.

This ensures that the fan procured can deliver enough power to fulfill the premises’ air circulation needs. The difference is simple, a 4-inch inline fan is smaller than a 6-inch inline fan and would be more suitable for smaller spaces.

Thus, before purchasing the inline fan, ensure that you calculate the room’s size to determine which inline fan would work best. 

Why do I need a 6 Inch Inline Fan for my Grow Tent?

Recently, there has been an upsurge in demand for inline fans for grow tents. This may not be a new concept for people who have grown plants in grow tents such as Marijuana.

However, for those who have not, it may interest you to know that an inline fan is the best bet you will place when it comes to successful grow tents or greenhouses.

Climate change has pushed farmers- whether a hobby or commercial farmers from outdoor to indoor farming as it has more yields. However, indoor farming has its challenges in air circulation, threatening the life of the plants.

This has then necessitated the use of inline fans as air conditioning drivers responsible for controlling humidity and temperature in the grow tents.

How Do I Choose the Best Inline Fan?

Even a third or fifth-time buyer of a 6 Inch Inline fan will admit that it is not an easy feat. There are various factors that one has to continually consider to get it right. It can take two buys and even as many as ten to get it right.

I understand these struggles and have made many mistakes in my purchases. The good thing is that mistakes are in place to facilitate learning, and knowledge is shared.

That is why I am sharing these factors that you should look into to ensure that you choose and buy the best six-inch inline fan.

A shoe that does not fit is not only uncomfortable but a waste of money, which is not easy to come by. Similarly, a size of an inline fan that does not fit the space’s needs is a waste of resources, including precious time.

Unfortunately, this is one of the predicaments that most buyers may find themselves while purchasing an inline fan. For instance, one without having read a guide such as this one may purchase a 6-inch fan for an 8 inch by 8-inch room.

While the fan will still work, it will not be as efficient as purchasing an 8-inch inline fan for a room that size. Therefore, first, measure your room size before settling on the fan to purchase. 

The material of the inline fan is another important factor to consider when purchasing an inline fan. Although buying an inline fan is not a one-time thing, it gets frustrating when you keep on buying equipment, and it breaks down, creating a cycle of procuring the same thing.

The best material that guarantees longevity for inline fans is steel. It even gets better if the inline fan has powder-coated steel, which helps in resisting weather change. Hence, look out for inline fans that are made from steel.

I don’t know how many have tried this- standing or sitting next to a noisy fan at full power. The noise would drive you crazy. Since most people do not appreciate the noise, it is a key consideration.

You also do not want to become the topic of discussion in the neighborhood for creating disturbances to the neighbors, which leaves one with no choice but to ensure that they look out for the fan that has less noise.

Fortunately, all the reviewed fans above have ultra-quiet operations unless they are broken down, under which circumstances you should get them repaired and maintained. 

The mention of repair and maintenance then brings in the next factor of consideration. How are you going to get that repair or maintenance?

When purchasing the inline fan, ensure that you look at the warranty and the terms stipulated within it. For how long after purchase will the company be willing to maintain and repair the fan? Which components of the fan do the warranty cover?

These are questions that will help you determine the best fan to procure since you do not want a fan to cost you much more in repair and maintenance than its initial purchase.

Best Quietest 6 Inch Inline Fan

1. AC Infinity CLOUDLINE T6, Quiet 6” Inline Duct Fan

AC Infinity CLOUDLINE T6, Quiet 6” Inline Duct...
  • Designed to ventilate hydroponic grow rooms, transfer heating/cooling, cool AV closets, and exhaust odors.
  • Intelligent controller with temperature and humidity programming, fan speed control, timer, and alarm system.
  • Mixed flow design combined with a PWM-controlled EC-motor for a truly quiet and energy efficient performance.
  • Kit also includes corded sensor probe, AC power plug, two duct clamps, and required mounting hardware.
  • Duct Size: 6” | Dimensions: 7.9 x 12.6 x 8.4 in. | Airflow: 402 CFM | Noise: 32 dBA | Bearings: Dual Ball

Noisy equipment in different living spaces can be quite disturbing whether they are far away from home or not. Well, with the AC Infinity CLOUDLINE T6, you do not have to worry about this as it has extra quiet operations.

It is also an energy-efficient inline fan meaning that electricity bills escalating to crazy amounts will not be a source of worry. The fan does not generate a lot of heat and utilizes low energy, which reduces energy efficiency.

The other advantage is that the fan comes with a two-year warranty. If the fan develops any fault within those two years, you will get free repair and replacements if the fault calls for that. Installation is also easy as the fan comes with a user manual.

One of the few limitations of this device is that they are smaller in size and, therefore, only applicable to smaller rooms. The manual speed adjustments are also quite irritating and can put the user off. However, this should not be a huge point of concern considering all the massive benefits one stands to gain with this fan.


  • Quiet operations
  • Energy-efficient inline fan
  • It comes with a two-year warranty.
  • Easy to install and use


  • Manual adjustments
  • Smaller size


2. Vortex 347 CFM S Line S-600 Fan

We all want to look for areas where we can save that extra coin. Thus, if we find an inline fan that is energy efficient, it will be on top of the list.

The Vortex 347 CFM S Line S-600 Fan, 6″ fits this description, giving you the first reason why it should be on top of your purchase list. It is also surprisingly easy to mount and unmount, meaning you do not have to wait for external help to do it.

The fan is also ultra-quiet, even at the highest speeds. You will not even be able to tell that there is a functioning fan in the room. The ultra-quiet operations are facilitated by the fan’s energy-saving design, which has double insulated walls making operations as quiet as possible.

This guide is all about making informed decisions. Thus, the drawbacks of the devices are an integral component here. It is vital to mention that even though the fan comes with a speed controller, users have often complained of its low quality.

They tend to break down easily, which leads to the motors emitting a humming sound. However, this can be fixed, and you will have your amazing 6-inch inline fan back!


  • Energy efficient
  • An ultra-quiet fan even on highest speeds
  • Easy installation


  • Poor quality speed controller


3. Active Air 400 CFM Inline Fan

Hydrofarm ACDF6 Active Air 6" Inline, 400 CFM Duct...
  • Active Air inline duct fans offer innovation & performance at a great price.
  • Active Air inline duct fans incorporate Brushless thermally protected AC motors with sealed for life Bearings (will not require any lubrication).
  • With a full line of fans to meet your needs, All Active Air fans feature: durable ceramic-coated metal housing, UL-recognized components, high quality molded impeller, low noise output, Includes mounting brackets and 8 foot pre-wired 120V cord.
  • Ul-recognized components
  • Includes mounting brackets and 8 foot pre-wired 120V cord

Have you ever used an item and experienced all its massive benefits that you long for the others to wear out so that you replace them with the newly discovered item?

That is my current experience with the Active Air 400 CFM Inline Fan, 6-Inch, which I am currently using for my grow tent. First, it is easy to install as it comes with mounting brackets.

It is also quiet, eliminating the disturbing noises that other fans may emit, almost driving one crazy. Its durability is also a plus for me as it has this ceramic-coated metal housing.

Lubricating ducts is not something that I enjoy doing, which the older inline fans force me to do. Therefore, when I learned that this inline fan does not require constant lubrication, I was over the moon.

We all cannot ignore these benefits despite the drawback of the equipment being a little bit heavy. Its weight should not be that much of a limiting factor as once you have fixed it; you do not need to move it a lot. Thus, the weight will only be a bother at the initial stages of mounting it.


  • Quiet operations
  • The ducts do not require lubrication.
  • Ceramic coated metal housing.
  • It comes with mounting brackets for ease of installation.


  • Heavy


4. Hurricane 435 CFM Inline Fan

Hurricane Inline Centrifugal Fan, High...
  • Commercial grade, high performance fans
  • Made of steel with a durable powder coated finish
  • Made with quality UL components for quiet operation
  • Easily installs in minutes
  • Fan come with an 8 ft 120 volt power cord

The majority of the customers that have bought the Hurricane 435 CFM Inline Fan, 6-Inch, have fallen in love with this inline fan.

From its whisper-quiet operation to its easy installation in any of the spaces you wish to use it on, there is nothing that could stop one from purchasing the fan.

Noise will be a thing of the past, whatever space you choose to use this fan in. On installation, it comes with mounting brackets meaning that the bulk of the job has already been completed for you.

Durability is another plus for this equipment. It has a steel casing, ensuring that you don’t have to go back to the shopping hunt for another inline fan soon unless you want an addition.

The fan also has a fan speed controller that helps adjust the speeds and facilitate proper air exchange. One of the notable drawbacks of this fan is that the blades are made of plastic.

Users have complained that the plastic blades move lesser air than metal blades. The plastic ones also seem more delicate than the metal blades giving a disadvantage for this 6-inch fan.


  • Durable due to its steel casing
  • Easy installation and set-up
  • Fan speed controller
  • Whisper-quiet operation


  • The blades are made of plastic.


5. Yescom HO 353CFM Hydroponics Ventilation 6 Inch Inline Cooling Duct Fan

Yescom HO 353CFM Hydroponics Ventilation 6" inches...
  • UL listed, CCC, CE, RoHS Certificated for safe use
  • Powerful and high efficiency - 2490 RPM and 353 CFM
  • Overall Dimension:15"L x 8-1/2"W x 14-1/4"H
  • Flange: 6" Dia
  • Power: 110-120V, 120W

Sometimes when making a purchase, one may be skeptical about having big investments in the equipment they are not sure about.

Well, if you are in such a position but you need a 6-inch inline fan, then the Yescom HO 353CFM Hydroponics will be your best investment.

It is cost-efficient and serves all the functions of a 6-inch inline fan effectively. Despite its cost efficiency, it can be used in small and large areas (industrial, commercial, and household).

Lubrication gives a headache to most people. However, this fan comes with permanently lubricated ball bearings eliminating this additional work and lengthening every unit’s life.

Noise is also minimal when using this fan since it features a backward curved impeller with vibration-free operation. Again, installation is a key issue when purchasing fans, and this is easy to install the inline fan as they come with a mounting set.

Further, the fan is moisture resistant, meaning that it works without the risk of breaking down even in damp spaces. However, some customers have complained that the blades seem to be improperly raked, leading to blowing both ways. 


  • Suitable for diverse environments- industrial, commercial, home
  • Permanently lubricated ball bearings
  • Easy to install
  • Moisture resistant
  • Cost-efficient


  • Some customers have complained that the blades seem to be improperly raked. 


6. Growsun 6 Inch Duct Fan Exhaust Kit Carbon Filter Fan Combo

Growsun 6 inch Duct Fan Exhaust Kit Carbon Filter...
  • 311 CFM Air Flow Inline Duct Fan,Run the Ambient Temperature Range: -20°C~60°C
  • Dimensions: 12.5" x 8.9" x 7.4" / Duct Size: 6", Design with Built-in Adjustable Two Speed Motor
  • 6 by 16-Inch Carbon Filter,Thickness of 1.5 Inches Activated Virgen Carbon, Removes 99.5% Of Volatiles From The Air
  • 2 inch Width,30 Yards Long, Environmental Water Glue Sticks Well to Metal
  • Dia 6 inch by Length 25 Feet Air Ducting with a Pair of Durable Clamps

Are carbon air filters worth considering when purchasing a 6-inch inline duct fan? Well, this is a question that may pass through most buyer’s minds. From experience, it is worth every coin purchasing a 6-inch inline duct with a carbon filter such as the Growsun 6 inch Duct Fan.

The carbon filter ensures that the air circulating through is cleaner by removing any odors, allergens, and other contaminants. The carbon filter is also responsible for ensuring that the fan removes up to 99.5 percent of volatiles from the air, leaving you with a fresh-smelling room.

Another advantage that is impossible to overlook is that this is a super quiet fan. You would even forget about its existence in space. It also comes with a variable fan control that helps you to adjust the speed to your liking.

The only limitation for this great equipment is that it may shake during operation, which is disturbing. However, this should not be a hindrance to getting this equipment that will transform your spaces. 


  • It comes with variable fan control.
  • It has a carbon filter.
  • Removes up to 99.5 percent of volatiles from the air
  • Super quiet fan


  • May shake during operation


Inline fans will no doubt make a massive change to your spaces. I know the fear that most people usually have of purchasing equipment such as inline fans.

But, what is there to fear while this guide has exhausted everything that you need to know? It is now time for you to get that inline fan you have dreamt of for a long time.

While at it, ensure that you consider all the facets that I have laid down above. It is also imperative to select one of the inline fans reviewed above because they are among the best and the quietest in the market.