Best 6 inch Inline Duct Fans Reviewed

A 6 inch inline duct fan is perfect to generate proper airflow in most grow tent setups. If you're looking to fight heat, humidity, mold, or other problems of bad ventilation, check my reviews of the best 6" inline fans on the market.

Top-of-the-line inline fan. Super-quiet, energy-efficient, and comes with all you need for easy setup.

4.7/5

Very well-designed 6" fan. Fast and capable of accommodating a range of grow tent sizes.

4.2/5

Designed for multi-task ventilation. Can be easily adapted for different setups. Made with durability in mind.

4.8/5

This sturdy and well built inline fan comes equipped with everything you need to mount it.

4.5/5

It's low price is very attractive. Plus power and performance to ventilate even large grow tents.

3.9/5

Powerful and quiet EC motor, duel propellers for extra power, and a wireless remote control for easy use.

4.6/5

Small, lightweight, and energy-efficient. Innovative design, and extra effort taken with the build.

4.4/5

Higher CFM means ventilation need never be a worry for you. Highly durable fiberglass reinforced plastic.

4.4/5

Includes and intelligent controller to combat any changes in the temperature. Noise-reducing design.

4.6/5

Perfect for small grow tents. Longer lifespan and is easy to install.

4.4/5

Best 6" Inline Fan Kit With CO2 Filter

By using a carbon filter you can prevent cannabis smells from leaving your grow tent. The following kits include 6" inline duct fans and carbon filters together.

The carbon filter and temperature humidity monitor are worth the extra asking price.

4/5

Easy installation, included speed controller, and the odor-reducing carbon filter are all sale points for this model.

4.6/5

This carbon filter is built to last and for increased odor absorbency. And a very durable duct fan.

3.8/5

The carbon filter kit is a real plus point, and it also has 8 feet of ducting combo for grow tent ventilation.

4/5

One of the least cheap kits. You do get a 16' of ducting, a carbon filter and a fan speed controller.

4.6/5

6” Duct Fans Reviewed

So you're probably wondering which 6 inch inline duct fan should you go for. There are lots to choose from on, and I have picked the best ones to review.

Our #1 Choice

AC Infinity CLOUDLINE S6, Quiet 6” Inline Duct Fan with Speed Controller

If you're looking for a top-of-the-line product, then this has to be your number one choice.

This American-made fan is super-quiet (which is perfect for stealth grow boxes), is energy-efficient, and comes with all of the mounting gear you will need for easy setup.

AC-Infinity-CLOUDLINE-S6
$109

Its speedand temperature controls also give you greater control over your growing environment.

With an airflow of 351 CFM, it should work for most grow tents, so should accommodate most setups.

The only drawback is the price, as it is a little more expensive than some inline duct fans. However, because it is energy-efficient, you should find it cost-effective.

Pros
  • Very low noise.
  • 8 different speed settings for regulating your temperature.
  • Fully programable temperature and humidity controls.
  • Built with energy-efficiency in mind.
  • Excellent build quality.
  • In-built alarm.
Cons
  • A higher than average price point.

Best Price-Quality Fan

VIVOSUN 6 Inch 390 CFM Inline Duct Fan with Variable Speed Controller

Vivosun are well-known for their excellent products, and this one offers excellent value for money.

It is well-designed for the most part, although the weak blades have been a problem for some.

The motors are fast and capable of ventilating your grow room in no time.

VIVOSUN-6-Inch-390-CFM
$79.99

The 390 CFM means to it can accommodate a range of grow tent sizes too.

The only drawbacks are the blades, although malfunctioning devices seem to be in the minority.

Pros
  • A well-built duct fan at an affordable price.
  • Easy to install with a 5.4 feet power cord.
  • Speed controller attached.
  • Plastic blades and housing reduce fan noise.
Cons
  • Some users have experienced scraping noises.

Most Versatile Inline Fan

Panasonic FV-30NFL1 WhisperLine 340 CFM

The Panasonic WhisperLine has been designed for multi-task ventilation. So, not only can you use it for your grow tent, but it can easily be adapted for different type of grow rooms too.

It can be installed in five different positions and comes with a truss and installation brackets to simplify the setup process.

Panasonic-FV-30NFL1-WhisperLine
$230.99

With its 340 CFM, this should be suitable for most cannabis growers.

The main drawback is the price although it has been made with durability in mind.

Some have complained the electrical hookup box is fiddly to set up, but this only seems to be the case when installing it within tighter grow spaces.

Pros
  • Thanks to an enclosed condenser motor and double suction blower, it is very quiet.
  • Its versatility means you can with different grow room setups.
  • Durable build.
Cons
  • Not cheap. Only for those looking to up their game.

Best Performance Fan

Hydrofarm ACDF6 Active Air 400 CFM

This active air inline fan from Hydrofarm is more than adequate for use as an exhaust fan. Moreover, because it’s made by Hydrofarm, you know that it’s designed and built with the needs of growers in mind.

This unit comes equipped with everything you need to mount and the ceramic coated green housing has two sturdy brackets in either side for hassle-free fixing.

Hydrofarm Model ACDF6-Active-Air-6-Inline-400-CFM-Duct-Fan
$126.13

And the 400 CFM output should be perfectly adequate to meet the needs of even large grow tents. However, those wanting to reduce fan speed will need to invest in a separate control unit.

While there are others on this list that offer similar performance for a slightly lower price, this unit is reassuringly robust, sturdy and well built from UI recognized components.

Pros
  • High power.
  • Made from UI recognized components.
  • Thermally protected motor and ceramic coated housing.
  • Permanently lubricated bearings.
Cons
  • Some users report that the unit is louder than advertised.
  • Fan speed control sold separately.

Best Cheaper Inline Fan

VIVOSUN 6 Inch 440 CFM ETL Certified

If you're just getting started and need a cheap inline duct fan, then this might be right up your street.

Its low price point is certainly very attractive, and with a 440 CFM capacity, it is very powerful. Of course, with all of the air it blows around, this isn't the quietest model on the market.

VIVOSUN 6 Inch 440 CFM ETL Certified
$69.99

You will often get that with a higher CFM, although many models get around this in the manufacturing process. Still, you can buy a separate noise reducer if the sound of the model bothers you.

Drawbacks include the scraping noises mentioned in our other Vivosun review and a slightly fiddly installation process. Still, you get what you pay for, although this is one of the better cheaper models on the market.

Pros
  • An affordable option for a first-time cannabis grower.
  • Powerful ventilation.
Cons
  • Noise problems.
  • Some users have found it difficult to mount.

Rising Star

TerraBloom 440 CFM with 0-100% Speed Controller

Billing its products as the next generation of EC Duct Fans, Terrabloom is certainly making quite a name for itself with the products they are manufacturing.

This has a powerful and quiet EC motor, duel jet type propellers for extra power, and a wireless remote control for easy use.

With 6 speeds to play with, you can easily regulate your growing environment. 

TerraBloom-ECMF-150
$94.99

And with a premium design that belies the low price, you also have something that will look good in your grow tent.

Pros
  • Excellent design.
  • Variable speed control for greater control over your growing environment.
  • A wireless remote that can be used outside of your grow tent.
Cons
  • Has a lot less sales than most other options in this list.

Best Quality Inline Fan

Can Max Mixed Flow 6-Inch 334 CFM

If you're looking for something small, lightweight, and energy-efficient, then this might be the inline duct fan for you. The quality design ensures it can fit into the smallest of grow spaces, so size should never be a problem.

Many have praised it for its innovative design, and for the extra effort taken with the build.

Can Max Mixed Flow 6-Inch 334 CFM
$259.95

It performs well with 334 CFM. It's not the cheapest on the market, however, and it's apparently not the quietest either.

Pros
  • Durable design that should last a long time.
  • Compact enough for small spaces.
  • Energy-efficient.
Cons
  • It isn't quiet at all.

Highest CFM 6" Inline Fan

Can-Fan Max Fan Pro Series 420 CFM

The higher CFM means ventilation need never be a worry within your grow tent. With a whopping 420 CFM, you have all the airflow you need to ensure a healthy yield.

This bad boy is highly durable too and has fiberglass reinforced plastic compounds for more robust housing.

Can-Fan Max Fan Pro Series 420 CFM
$230.95

The advanced design ensures it's not as loud as you would imagine, which is rare for a fan with a high CFM . Sure, it's not the quietest on the market, but on lower speed settings, the noise shouldn't bother you.

Pros
  • Extremely powerful.
  • Perfect for a large growing area.
  • Highly durable.
Cons
  • Less cheap item on this list.

Best Inline Fan with Climate Control

AC Infinity CLOUDLINE T6 402 CFM with Temp and Humidity Controller

It might be one of the more expensive models on the market, but AC Infinity are leaders in their field.

The selling point here is the included intelligent controller. It uses an onboard processor to combat any changes in the temperature, so you won't need to make any changes manually.

AC-Infinity-CLOUDLINE-T6
$149

The controller can also be set at the speed of your choice to ensure a healthier yield.

With advanced temperature and humidity controls, and a noise-reducing design, this is certainly a good choice.

Pros
  • Advanced temperature controls.
  • Quiet and energy-efficient.
  • A mixed flow design ensures the fan works optimally in harsh conditions.
Cons
  • Only for growers who want to manage every detail.

Best Rated Less-Expensive Fan

VIVOSUN 6 inch Inline Duct Fan 240 CFM

If you have a low budget and need something that works ASAP, this is the one is for you.

It has a 240 CM rating, which can be perfect for small grow tents. It has balanced blades for a longer lifespan, and is easy to install. 

VIVOSUN 6 inch Inline Duct Fan 240 CFM
$29.99

The only drawback is the loud noise that some have deemed 'deafening,' so if you're looking for something quiet, this isn't the model for you.

Pros
  • Cheap and reasonably powerful.
  • Gets the job done.
Cons
  • Noisy.

6" Inline Fan Kit With Carbon Filter, Ducting And More

If you're going to get a CO2 filter to reduce odors coming from your grow tent, you might as well get the whole kit in one. Here's the best deals I've found for inline fans with carbon filter kits.

VIVOSUN 6 Inch 390 CFM, with Speed Controller, Carbon Filter, 8 Feet of Ducting, Temperature Humidity Monitor

We have already reviewed this model, but if you're willing to pay a little extra, you get the whole kit with its included benefits.

The carbon filter and temperature humidity monitor are worth the extra asking price, and all together, this model is cheaper.

VIVOSUN-6-Inch-390-CFM-Inline-Fan-Carbon-Filter-Kit
$159.99

The motors are fast and capable of ventilating your grow room in no time. The 390 CFM means to it can accommodate a range of grow tent sizes too.

Pros
  • Excellent value for money.
  • Easy to install with four different methods to choose from.
  • Plastic blades and housing reduce fan noise.
Cons
  • Some users have experienced scraping noises.

iPower 6 Inch Fan 442 CFM with Carbon Filter, 25 Feet Ducting Combo, Variable Speed Controller and Rope Hanger

Easy installation, included speed controller, and the odor-reducing carbon filter are all sale points for this model.

Some have complained that the fan can get hot, however, and there have been mixed reports on how quiet/noisy it is. The model is quite pricey too.

iPower 6 Inch 442 CFM and Carbon Filter
$159.79

Still, it is highly durable, and the inner and outer mesh increases the model's airflow. It should last you a long time too, but it might be worth researching fan heat and noise on the model before making a purchase.

Pros
  • Increased airflow.
  • Easy to set up.
  • Included speed controller.
  • Rope hanger accessory.
Cons
  • Reports of fan heat and noise.

VIVOSUN 6 Inch 440 CFM Fan with Speed Controller, Carbon Filter, 8 Feet of Ducting, Temperature Humidity Monitor

The carbon filter kit is a real plus point, and it also has 8 feet of ducting combo for grow tent ventilation.

Its low price point is certainly very attractive, and with a 440 CFM capacity, it is very powerful. Of course, with all of the air it blows around, this isn’t the quietest model on the market.

Unfortunately, there have been reports of early breakdowns.

VIVOSUN-6-Inch-440-CFM-Carbon-Filter-Kit
$159.99

Some users have complained the fan broke down after only a few months of operation, but this is not the case for the majority of customers.

Pros
  • Cheapest kit on the list.
  • Powerful airflow.
  • Speed controller included.
Cons
  • Might not be the most reliable.

VIVOHOME 6 Inch 440CFM with Carbon Filter and 8 Feet Duct

The air carbon filter utilizes Australian raw carbon for increased odor absorbency, and it is built to last too.

The vent hose has been constructed of aluminum foil, and this has been laminated to avoid corrosion.

On the whole, this is a very durable duct fan, but it's not perfect.

VIVOHOME 6 inch 440 CFM and Carbon Filter
$---

On the downside, some have complained the fans are pretty loud. And as seems to be the case with models from this company after a few month's use.

Pros
  • Increased odor absorbency.
  • Rustproof.
  • Easy to install.
Cons
  • Louder than others.

iPower 6 Inch 350 CFM With Carbon Filter, 16 Feet Ducting, Speed Controller and Temperature Humidity Monitor​

This is one of the least cheap kits. However, you do get a 16 feet of flexible aluminum ducting, a carbon filter and a fan speed controller.

You also get rope hangers, a temperature-humidity monitor, so when it comes to getting your money's worth, you can't go wrong here.

iPower 6 Inch 350 CFM and Carbon Filter
$154.69

Aside from the steep price, some have complained about the carbon filter. However, these complaints are in the minority, so you might still give this a go if you can afford it.

Pros
  • Very complete kit. You may need nothing more.
Cons
  • A couple of reports about ineffective carbon filter.

Final Thoughts

When it comes to buying an inline duct fan, you certainly have a lot to choose from. However, we think the AC Infinity CLOUDLINE S6 is the best of the bunch.

It's not the cheapest on the market, but it's not the most expensive. It has a high CFM but is still remarkably quiet. The fully programmable humidity and temperature controls are a definite plus point. And it's energy-efficient too.

Some of our other 6" inline duct fans choices have been lacking when it comes to durability and noise, but this one rises well above them. 

Santiago
Santiago
Hey there, I'm the person behind this website. I started growing cannabis in 2014 right after marijuana was legalized in my home country. Today, on drcannabis.io, I address growers need for knowledge and show you how to grow cannabis plants and enjoy amazing buds.

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