10 Best Inline Fans For Your Grow Room In 2021

If you are growing indoors, ventilation of your growing space is extremely important. Since most growing rooms or tents are closed and cramped, without a proper fan in line, you want to overheat your growing space and kill your plants.

These are our top tips for built-in fans from now on, along with some important information on how to choose the one that best suits the size of your growing room or tent.

10 best reviews from fans

1. Hydrofarm Active Air 6 “built-in fan

Hydrofarm manufactures some of the best comprehensive water equipment on the market and the Active Air line fan range is no exception. This 15 cm diameter fan is our best choice as 6 inches is the diameter we use most in our ventilation system. For the combination of price and functionality, Hydrofarm is hard to beat.


  • Well-known, trusted brand in the industry
  • High CFM for the price
  • Bring everything you need to put it together

Bad choice:

  • Lighter than our Premium 6 ”inline fan

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2. AC Infinity Cloudline S6

American Cloudline from AC Infinity is definitely a top product with a decent price. It is energy efficient and extremely quiet and comes as a plug-and-play unit with speed control, all fasteners and the fan itself. Precise humidity sensors and temperature sensors help you set a fully programmable controller for optimal conditions.

But as the saying goes, everything has its price and the price of AC Infinity is significantly higher than other fans. Well worth the money. But if budgeting is a problem, this could be one to save for.


  • Energy saving
  • Much quieter than other 6-inch fans
  • Prolonged working methods

Bad choice:

  • The price for a 6-inch channel fan is above average

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3. AC Infinity Cloudline T6

Where the Cloudline S6 shines, it really shines. In addition to the speed control, fan speed control and other S6 functions, the digital controls are even more individual. A backup system keeps the memory armed so that the custom speed settings you enter are saved. Countdown systems and alarm timers help you keep track of your status. It is an environmental mode if you are trying to reduce your energy consumption. Even better, the T6 can share its smart control with the older S6, so both can run with the same updated programming.

But there is a problem. The newer T6 model seems to have temporary flaws in the alarm settings and is sometimes triggered for no reason. It can be frustrating to use the alarm to alert you to a rise in temperature or humidity. As great as the updates are, the S6 is an even better click until they update the T6 software.


  • Includes temperature and humidity control
  • Alarm system on the control system
  • Extremely quiet

Bad choice:

  • The most expensive on our list
  • Sometimes the warning can be triggered accidentally

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4. Hydrofarm Active Air 8 “built-in fan

A durable ceramic-coated metal housing forms the frame on which this powerful fan is built. Like all Hydrofarm Active Air ranges, it is equipped with premium components and designed for durability. Thanks to the low noise level, this refreshing, quiet way to disperse airflow or remove excess moisture.

Speed ​​control is not included in any of the Hydrofarm systems, but they are available for a small surcharge. The only downside to this particular 8-inch model is that, like many Hydrofarm fans, they are designed for use with rigid channels. Flexible wiring is extremely difficult to connect.


  • Calm action
  • Reliable manufacturer with a great reputation
  • Comes with all installation parts as a plug-and-play unit

Bad choice:

  • Speed ​​controls are not included, although they are available at a surcharge
  • Really should be used with inflexible piping

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5. AC Infinity Cloudline T8

I’m not saying that AC Infinity’s Cloud Infinity is for everyone … but it’s perfect for those who want it. The power cord for all Cloudline models is long and easy to install in cultivation rooms or tents. They are really made as fans in ducts and can easily be connected to flexible and rigid ducts.

Like other models, it comes with all fasteners. However, they have been replaced by a clever controller in the humidity control in the box, probably due to T6 warning problems.


  • Fan speed fully adjustable from light breeze to strong winds
  • Built in the United States, built to last

Bad choice:

  • Has no longer come with smart control but has humidity control
  • Higher prices than other fans

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6. Vivosun 8 “built-in fan

Are you getting started and need a manageable attraction for your business? Vivosun may not be one of the best built-in fans out there, but it’s the perfect starting point. Low prices make it valuable for budget growth space, especially if you are just looking for an air intake fan.

However, the disadvantages of low prices can hinder the experienced user. It has a short cable that makes it a bit difficult to connect. Carbon filtration is not an option as it is simply not powerful enough to support it. And occasionally, users have looked at engine failures while testing a new device – even though they are credited with quickly replacing broken devices.

For someone just getting started, this is a great way to learn what works best for your growing environment.


  • Very economical
  • Full metal construction
  • Works well as an intake fan

Bad choice:

  • Not designed for use with a carbon filter
  • Short power cord
  • Some users immediately noticed faulty motors

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7. Hydrofarm Active Air 10. Fan

Like other Hydrofarm fans we’ve introduced, this 10-inch model doesn’t have speed control either. However, it is still a very reliable infusion line, just like others in its class. The 760 CFM rating makes this a great choice for larger spaces.


  • Reliable, reputable manufacturer
  • Including mounting brackets
  • Great quality fan at a reasonable price

Bad choice:

  • Large diameter fan
  • Works best with stiff channels

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8. iPower 10 ari infusion line

Fans of the iPower series are a good number of intermediate fans. It does not come with all the bells and whistles in one neat package. So if you are looking for more than just one fan this could be disappointing. Very likely, you will probably get a corded fan in this box and little else.

That said, the fan usually has a fairly decent lifespan and may be a little easier to set up for beginners. It’s louder than most others on the list, but that might not be a disadvantage if you are ventilating the outdoors. My biggest complaint to this fan is the composite blades and the center, where I prefer metal, and even that is a minor complaint.


  • On both ribs ends to attach pipes
  • Can be used with carbon filtration
  • Very reasonable price

Bad choice:

  • Slightly higher fan than others we came across
  • The fan blade and the center are made of composite material instead of metal

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9. Hydrofarm Active Air 12 “built-in fan

In principle, everything we have said about this fan range applies to the 12-inch model, except that it is the largest and highest CFM rating in the fan range. Reliable, powerful, ceramic-coated and inexpensive – a good starting point for most people.


  • Well built, good life
  • The manufacturer is reputable and reliable
  • Great price for a large diameter fan

Bad choice:

  • Requires rigid channels to make the most of

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10. iPower 12 ″ infusion line

The same pros and cons of the 10-inch iPower apply to the 12-inch fan. Slightly higher than most fans on our list, it’s still a pretty decent product. It is ready for use right out of the box. So do not expect any fancy feelings. However, the wavy shape easily attaches to your system and the price for this fan is great.


  • Mocked features make it easy to hang up in your sewer system
  • Carbon filters are available for this fan
  • Reasonable price for its size

Bad choice:

  • Composite fan / center instead of metal
  • Louder than other fan brands

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Choose the right fan

Best inline fan
Choose the best fan for your CFM needs.

When you grow indoors, you control it complete Environment. Light, temperature, humidity … and ventilation. While it is important to know about the best growing lights for your garden, many growers forget about ventilation and the effect it can have on growth. Here are some things to keep in mind when choosing a built-in fan.

Why is it important to get fans online?

Without justice Let the ventilation of the room growYou are letting your growing business fail before you even start. Narrow space and controlled environment alike Let the tent grow or need space for reflection and planning to achieve high returns.

In-line fans help to remove stale air from the system, which often passes through multiple filters. For example, carbon odor filters are often connected to ventilation systems to prevent the spread of unwanted odors into the environment.

What is CFM and how do I calculate it?

One important measurement that you will see on any fan is CFM or cubic meters per minute. This number refers to – you guessed it – cubic meters per minute of air that the fan you are considering can move from a specific area.

For example, imagine you have a room measuring 8 x 10 x 12 inches. This is 384 cubic meters (4x4x8) of space. Now let’s imagine you wanted to act everything the air in this room with fresh air once a minute. You might think you need a fan rated 384 CFM, but you’re wrong.

It is always a good idea to multiply the cubic meters of your free space by at least 1.33 to account for the decreasing airflow due to the filter, etc., which is attached to the ventilation system.

With this 1.33-fold multiplier, we get the required CFM number ~ 510 to freshen up the air in our growth room once a minute. There are other factors to consider when calculating your airflow, such as:

Your growth lights

That type Let the light grow Their use has a profound effect on your ventilation needs. HID lights (HPS, MH) become hotter than others (LED, CFL) and thus heat your growing tent or room faster and require more ventilation.

Growing with HID lighting adds 5% to calculations for each light you use in your growth room. If your HID lamps are not air conditioned, you will need to set this by 10 to 20% as your lamps cannot be cooled at all which means your ventilation system will have to weigh more.

Carbon or CO2 filters

When connecting filters to your ventilation system, it is important to take this into account in your calculations. Add at least 20% to your CFM calculation if your channels have related filters.

Average temperature

If you are growing in a room that will be warmer than average right from the gate, then you want to increase your CFM calculations by at least 25% to make sure you ventilate enough. When you have a double punch at high temperatures and high humidity, increase this figure by 40%.

The length of your channel

The length of the tubes can affect how much force you need to get air out of your growing space. By rotating and turning in the ventilation setup, the CFM needed to exchange air at the right speed increases.

What diameter of infusion line should I get?

Vivosun built-in fan
Example of a Vivosun fan with fixed channels.

One factor that influences your decision is the diameter of the fan. Larger fans lower the relative humidity in the growing area faster than those with smaller diameters.

Smaller diameter fans often have lower CFM ratings, but you still need the right CFM for your space. After you have calculated your minimum CFM needs, choose the smallest diameter fan he can deliver. If you want to go a little higher than necessary, that’s fine, but keep in mind that it can lower the humidity.

Other factors to consider

There are many other factors that influence your decision to buy when it comes to a fan. Here are some of the most common:

What is the fan used for?

There are two basic uses for a fan: inlet or outlet. Ingestion is an air vent into the room, often through a carbon filter, to remove pests or unwanted dust / pollen. Exhaust gas circulates air from the room.

Most installations are based on exhaust ports rather than inlet ports. This is mainly because removing excess heat or moisture is much more common than having to force air into a room. Our recommendations today focus on exhaust needs, although these fans can be used for intake if desired.

Indirect air intake meets most growing needs. When you squeeze air out of a room, it cracks more naturally through cracks or holes. In addition, there is dust, pollen or dirt that can float in the air.

Active intake, such as using a fan, is usually a price that most growers do not have to pay unless they are trying to prevent pests or pollution from affecting their crops. They can be useful and combined with additional carbon dioxide, but it is a fine-tuned measure that is not required for all but the most specific manufacturers.

Need speed control?

Speed ​​control can be fun but generally not required. If your fan has the CFM range you want, then you never really need to fix it.

If you would rather have more engine power than for your space (possibly to make room for expansion in the future), a cruise control may be an option. With speed control, you can reduce your CFM fan from the maximum level to current requirements. If you enlarge later according to the functions of the fan, the speed control is no longer necessary.

The green fingers behind this article:

Last updated 22-03-2021 / Related links / images from the Amazon Product Submission