6 Inch Inline Fan

Best 6 Inch Inline Fan

Are you planning to set-up an indoor garden or you already have one? If yes, you need to give importance to proper ventilation. The solution? A good-quality 6 inch inline fan.

Inline fans help reduce the heat and allow the air to flow naturally inside the grow room. To know more about it, here’s a guide.

Read our Best 6 Inch Inline Fan Review to find out.

AC Infinity CLOUDLINE T6, Quiet 6” Inline Duct Fan with Temperature Humidity Controller

AC Infinity CLOUDLINE T6, Quiet 6” Inline Duct Fan with Temperature Humidity Controller

If you are looking for a model that has smarter, quieter features and energy efficiency, then the AC Infinity CLOUDLINE T6 can be one of your best options. The unit contains a programmable control to help you automatically adjust the air circulation, temperature, and humidity of your grow room. The fan also operates quietly, producing only a sound of about 32 decibels.

It’s also convenient to use if you have many errands to do since you don’t need to always go and check your grow room. It also features an alarm system that notifies you of failure alerts and allows your fan to turn to eco mode to help you conserve energy.

This unit can also adjust its motor performance according to the specific speed rate you set, allowing you to achieve better efficiency by 40%.

The fan is quite durable as well since it is made with a matte-finished and heavy-duty steel that remains lightweight. Another feature of this unit is its being labeled as IP44. This means it can protect itself from dust, mildew, and water splashes, so you won’t have to worry about placing it in any type of environment.


  • Energy-efficient and quiet operation.
  • Programmable controls to automatically adjust settings.
  • Features an alarm system to notify you of failure alerts or turning the fan into eco mode.
  • The control panel has a more professional, decent look and easy to operate.
  • You have the option to connect it to another smart controller, like the CLOUDLINE S6, for better airflow.


  • It’s way too pricey compared to other products on this list.
  • There’s a tendency that the controller may malfunction with prolonged use.
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VIVOSUN 6 Inch Inline Duct Fan 240 CFM

VIVOSUN 6 Inch Inline Duct Fan 240 CFM

The VIVOSUN inline duct fan may not be considered as the best inline fan among gardeners, but for a newbie grower, it’s something you can start with. Since most beginners start with a low-budget grow room, this model fits perfectly with its affordable price yet good performance.

It has upgraded features to provide you with quiet operation and long-lasting service. The motor is properly lubricated to help reduce the sound it produces and prevent frequent maintenance. It also serves a dual purpose as an inline and exhaust fan so it can bring fresh air to your plants.

Though it doesn’t look like one, it is surprisingly lightweight and portable enough to fit in small grow rooms or tents. It may not be as quiet as you expect it to be, but with the use of a speed controller, it can minimize the sound it produces.

Overall, it can still compete as a better option for inline fans among other brands and models.


  • Affordable price perfect for beginners.
  • It is all-metal made, making it durable enough for prolonged use.
  • It has good performance as an intake fan.
  • The fan is easy to install and fits perfectly in small grow rooms.
  • It can work well in a harsh environment.


  • It produces a much louder sound.
  • It is not suitable to use along with carbon filters.
  • It has a 5.5 feet power cord which is considered short among gardeners.
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iPower 6 Inch 442 CFM Inline Duct Ventilation Fan HVAC Exhaust Blower for Grow Tent

iPower 6 Inch 442 CFM Inline Duct Ventilation Fan HVAC Exhaust Blower for Grow Tent

iPower is a brand that is popular for its innovativeness, which is evident in every unit they produce. The iPower 6-inch inline duct fan has quality components to achieve quiet operation, which most gardeners prefer these days.

The unit comes with a ceramic coat to provide durability and prevent rusting. It also contains permanent lubrication so it won’t need any kind of maintenance. This inline fan is cost-efficient and practical to use.

The iPower 6’s fan blades can operate quietly but when you increase the amount of air, it will cause too much noise. If your house and neighboring houses are located at a great distance from your grow room, then the noise won’t be that much of a problem.

Most users find it easy to install this fan as it comes with flexible installation options. The entire unit includes mounting hardware with an 8 feet and 120-volt power cord. For better positioning, you can place the brackets parallel to the inline fan.


  • Works well in a 4x10 grow room.
  • It can work smoothly and at ease considering its price range.
  • It is ceramic coated, which makes it strong enough to handle harsh environments.
  • Easy to install and maneuver on.


  • Machine failure can be experienced for only a few months after the purchase.
  • A little noisier than the usual.
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Hydrofarm ACDF6 Active Air 6" Inline, 400 CFM Duct Fan

Hydrofarm ACDF6 Active Air 6 Inline, 400 CFM Duct Fan

Hydrofarm’s Active Air inline fans is one of the best ventilation fans used for hydroponics purposes. This 6-inch inline fan is the most recommended choice for any ventilation system you have.

The good thing about this fan is it is made of hard ceramic coatings and is also made of hard steel. Because of this, similar from the inline fans mentioned above, this can also thrive in harsh environments.

The fan can provide high performance airflow that can innovate your current grow room’s overall ventilation system.

It is also energy proficient and can quietly operate. Its AC motor is also thermally protected to avoid overheating, both of the fan and the temperature inside the grow room. One of the downsides of this product is it can produce loud noise as you increase the volume of airflow.


  • Comes with a high-grade impeller to help increase airflow.
  • Includes tools needed for mounting.
  • Has a high CFM considering its price range.
  • Flexible and easy options for installation.
  • Safe to use and has high durability.


  • Produces loud noise when airflow volume is adjusted.
  • Some units break easily.
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TerraBloom ECMF-150, Quiet 6" Inline Duct Fan with 0-100% Variable Speed Controllable EC Moto

TerraBloom ECMF-150, Quiet 6 Inline Duct Fan with 0-100% Variable Speed Controllable EC Moto

If your priority is to boost airflow in your grow room, the TerraBloom fan is one of the best options you can choose. Unlike other inline fans in the market on the same quality range as this product, this model of TerraBloom features a new generation EC motor to help save energy.

The fan can be fully adjusted and only produces quiet sound, a perfect fan to use when your grow room is somewhere near your home. Even if you adjust the speed rate, there will be no additional noise it can produce.

Because the housing of the fan is airtight steel, it can also resist any type of environmental condition, minimizing maintenance issues inside your grow room.

The product comes with a speed controller that is connected to the fan through a cable.


  • Equipped with an energy-saving EC motor.
  • Has an adjustable controller to help you operate the amount of airflow effectively.
  • Can withstand harsh conditions because of its steel body and airtight seal.
  • Has a compact design to fit smaller grow rooms or tents.


  • After prolonged use, it can become noisier than usual.
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Things to Consider Before Buying an Inline Fan

6 Inch Inline Fan

Inline fans are a must-have in indoor gardening to grow your crops. Grow rooms and tents have a tight space that traps the air inside, resulting in air stagnation, causing your plants to die.

For gardeners, it’s heartbreaking. So to prevent this from happening, you need to have an inline fan in your grow room to give stable air circulation and a natural outdoor environment for your plants.

When the air inside is continuously moving, it prevents too much moisture that causes molds, mildew, and pests to appear. With the right type and proper placement, inline fans can even help strengthen your plants and give abundant yields.

With all these facts, you probably start checking online on which one you should buy. Since there are so many options available in the market, it will make things difficult for you to decide on which one to buy. Not only that, but you also have to consider some features of the fan if it fits your garden set-up.

Size of Your Grow Room

The size of your grow room is the most important thing to consider before you spend your money on the right fan. This will help you know the CFM of the fan you need and avoid wasting a lot of pennies on the one you don’t need.

CFM (Cubic Feet per Minute)

After knowing the size of your grow room, the next thing you need to know is the CFM or the cubic feet per minute. This refers to how long the fan can exchange the air in minutes within the cubic feet measurement of the room.

To calculate the CFM, divide the cubic feet measured by time in minutes. To get the room’s cubic feet measurement, multiply its length, width, and height. After getting the product, divide it by the number of minutes.

If you don’t like math, here’s an example for you to understand how it works. Don’t worry, it’s simple!

Let’s say, for example, your grow room measures 10 feet in length, 8 feet in width, and 6 feet in height. Multiply all this and you get 480 cubic feet. Then, divide this by the number of minutes you prefer.

The suggested rate for air replacement is from 1 to 5 minutes. Based on the example, if you want to complete air circulation within 1 minute, you need a CFM of 480; and for 5 minutes, it will be 96. On average, you need to look for an inline fan within 96 to 480 CFM.

Easy, right? Just make sure you get the right measurement and you’re all set.

Noise Level

If you are living in a quiet neighborhood, of course, you will choose a quieter fan to avoid disturbing family members and neighbors from the loud noise your fan produces. Today, it’s no longer hard to find an inline fan with a quiet sound feature since it is now considered as one of the major components in modern ventilation fans.

Others opt for adding silencers in the current fans they use. It’s not always an option since by adding some extra dollars, you can already buy a good quality type with a softer sound.

The noise level is parallel to the speed of the fan. For less noise, choose the one with a slower speed rate per minute but will still provide good performance.

Length of Duct

Inline fans operate with ducting and its length affects the amount of energy to pull the air out of the grow room. Make sure to place it straight, as much as possible, to achieve better ventilation.

If you can’t avoid twisting the ducts of your ventilation set-up, then consider increasing the CFM since it will need a lot of energy to move the air in the curve of the duct.


The type of material where the body of the fan is made is also important to take note of. Choose the model with double-coated steel to avoid rusting and frequent maintenance. This will not just help you save budget but also prevent unnecessary dirt and dust inside the grow room.

Price and Budget

Last, but not the least, and must also be included in this list, is your budget. There are times when you already know the type of fan that you need, but the problem is it's way too pricey from your allotted budget.

If you check hard enough, you can find an affordable fan without sacrificing the performance and one that meets your needs. To better help you out on deciding on the best inline fan you can purchase, here are some recommendations to guide you.


With all the great options in this list, it’s easy to understand if you still find yourself undecided on which inline fan to use.

But overall, the AC Infinity CLOUDLINE T6 tops the list because of its innovative features and modern style. Though it is the most expensive in the list, its price is reasonable because of the convenience you can get when using the product.

By investing in a good quality inline fan, you can achieve the best ventilation system you can have for your indoor garden and your plants will thank you for that.

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