10 Best Inline Fans For Your Grow Room In 2021

Ed Wike
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Air circulates in grow rooms by way of several different means. On smaller grows, there isn’t always enough circulation to warrant special equipment, but on larger grows (such as commercial operations), advanced in-line fans are a must! These fans are a few of the best in the industry and are sure to help keep the temperature and CO2 low.

NameCategoryProduct
Hydrofarm ACDF6 Active Air 6" InlineBest OverallHydrofarm ACDF6 Active Air 6" Inline
VIVOSUN 6 inch Inline Duct Fan 240 CFMBudget PickVIVOSUN 6 inch Inline Duct Fan 240 CFM
Hydrofarm Active Air ACDF12 969 CFM in-Line DuctUpgrade PickHydrofarm Active Air ACDF12 969 CFM in-Line Duct

1. Hydrofarm ACDF6 Active Air 6" Inline

Our rating: 9 / 10

Hydrofarm ACDF6 Active Air 6" Inline

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Pros:

  • Budget-friendly
  • Ideal for ventilation purposes
  • Easy to install and operate
  • It has a built-in overload protection
  • Very high CFM
  • Exceptional air delivery efficiency
  • Single Ph connection
  • Durable construction
  • Made from high-quality materials

Cons:

  • The frame could be sturdier
  • Not perfect for grow rooms with less airflow
  • May require extra reinforcement when securing the duct

The ACDF6 is an inline grow room fans designed to provide you with 400 CFM air delivery. It is an excellent choice for ventilation purposes, and it can be used to deliver the air to a larger grow area.

This inline fan offers an unwavering air flow efficiency that will provide you with the nutrients it needs for better growth. The active air performance combines with an extreme durability, resulting in a fan that will last for years.

The ACDF6 features an overload protection that renders it safe to run without the worry of a short-circuit and potentially damaging your electrical equipment.

2. AC Infinity CLOUDLINE T6

Our rating: 9 / 10

AC Infinity CLOUDLINE T6

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Pros:

  • A great value for a do-it-all inline fan
  • Relatively quiet operation
  • Comes with a humidistat and temperature controller
  • Well-built with no frills
  • The controller has some advanced features for a budget fan.

Cons:

  • Only 6” inline
  • Not for forced air heating/cooling systems. Ie: only works with a forced air grow tent.
  • Doesn’t come with the mounting bracket. You need to buy it separately.

Indoor Garden, and Space Heating.

The AC Infinity is a 6” inline duct fan (109 cfm) with a built-in humidistat and temperature controller. It has a super quiet Vortex Airflow design with whisper-quiet operation. This inline fan comes with sturdy vibration-free ABS and metal fan housing. The motor is thermally protected and has a safety strap on all models.

The AC Infinity also comes with a 3 speed controller and a pre-wired 5' cord. It measures 15.5 x 1.5 x 9.1”. You must install a mounting bracket to direct the airflow towards your plants.

3. AC Infinity CLOUDLINE S6

Our rating: 9 / 10

AC Infinity CLOUDLINE S6

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Pros:

  • Very low noise level
  • Comes with a speed controller
  • Sizes available up to 20 inches
  • Has an automatic overheat protection
  • It’s very lightweight

Greenhouse – Plant Dorma.

Finding an inline fan for the grow room that is quiet and can be used with a humidifier can be somewhat of a challenge. If you are having any issues with the AC Infinity CLOUDLINE S6, you might be interested to know that you can connect in line humidifiers to the fan to help humidify the room for your plants.

As a grow room fan, it has a noise level between 30-36dBA. The top rated inline fans have a noise level of 45dBA. The AC Infinity CLOUDLINE S6 has a very low level of sound that is perfect for noise sensitive areas.

4. AC Infinity CLOUDLINE T8

Our rating: 9 / 10

AC Infinity CLOUDLINE T8

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Pros:

  • Works at high and low pressures
  • It has a temperature-sensing humidity controller
  • Very lightweight fan
  • It includes a recessed powercord
  • Doesn’t make a lot of noise

Cons:

  • You need to buy 100-foot (or more) duct to use it
  • The build quality is average
  • Must be used with a thermostat to work efficiently

This best-selling AC Infinity inline fan is a burly one that can be used in ventilation systems. It can handle both high and low pressures. You can also attach it to a separate thermostat to let the fan run only when needed. This is useful for saving energy, especially when drying crops after harvesting.

The AC Infinity CLOUDLINE T8 comes with a temperature-sensing humidity controller. This makes it ideal for humid, indoor growing zones like your grow tent. It makes it easier for you to adjust the level of moisture in the grow tent.

But it can also be used outdoors since it is a powerful fan. It has an air output of 12,000-CFM, which is more than enough to handle the ventilation needs of even large grow rooms. This fan includes a complete installation kit that includes a duct connector, inline duct wraps, and mounting hardware.

5. Hydrofarm ACDF8 Active Air Inline Fan

Our rating: 8 / 10

Hydrofarm ACDF8 Active Air Inline Fan

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Pros:

  • Powerful air circulation
  • Quiet operation
  • 8 inch fan head
  • Very affordable

Cons:

  • Needs to be paired with an inline ducting to work
  • Air flow is directional, so it doesn’t point in all directions.

This upgrade on the classic inline fan mounts above your grow room. This has the advantage that the air around it is cooler so it doesn’t strain the fan itself. It has a smaller head than most of the other inline fans, so it may need to be used in tandem with a duct. However, it does move a decent amount of air for its size.

It comes with a permanent mount that’s built into the fan body and weighs in at around two pounds. The frame is constructed from plastic and comes in a range of colors. The ducting is similarly lightweight and very easy to use.

The Active Air Inline Fans are designed to be used indoors only.

6. iPower 10 Inch 862 CFM Inline Duct Ventilation Fan HVAC Exhaust Blower

Our rating: 8 / 10

iPower 10 Inch 862 CFM Inline Duct Ventilation Fan HVAC Exhaust Blower

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Pros:

  • Available in different sizes
  • Super quiet operation
  • High CFM and super efficient
  • Acoustic reduction baffles
  • It’s a three-speed fan

Cons:

  • The pull chain is not included, and has to buy it separately
  • The wire clips are a bit fragile
  • The wire seems slightly thin for the length

This iPower Grow Room Fan has an air displacement rating of 862 cubic feet per minute. It is an inline duct fan which can be easily installed to your grow tent setup. You can quickly connect it from your grow tent to your ducting system, and you’re all set to go.

This inline duct fan has a centrifugal ventilator fan which ensures that the flow of air will be even and efficient. It features an EMI reduction foam filter which is designed to capture dust, dirt, and ¦¦he as much as possible from entering the exhaust. It will ensure that your grow room is as clean as it can be. Plus, the eight included mounting clips ensure that it fits snugly into your grow tent.

7. VIVOSUN 8 inch Inline Fan Duct Fan 420 CFM

Our rating: 8 / 10

VIVOSUN 8 inch Inline Fan Duct Fan 420 CFM

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Pros:

  • Very low noise level of only 19.2 dB
  • High CFM and air flow
  • Efficient and well-built
  • High quality motor with durable wiring

Cons:

  • Doesn’t include a screen to prevent foreign items from getting sucked in
  • The cables are fairly thin
  • Not very effective against odors

If you are looking for an inline duct fan with high CFM (airflow), the VIVOSUN 8 inch in-line duct fan is an excellent choice. With lower noise levels and high CFM, it’s one of the better inline fans we came across while doing our research.

The VIVOSUN 8 inch duct fan comes equipped with a thermostat control that can be set at temperatures ranging from 45°C to 65°C. It also comes with a high quality 8 inch propeller fan with a life of 35,000 hours.

It operates on less than 10 amps of current, and the grounded 3-pole electric plug will keep this fan connected to a reliable power source.

8. VIVOSUN 6 inch Inline Duct Fan 240 CFM

Our rating: 8 / 10

VIVOSUN 6 inch Inline Duct Fan 240 CFM

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Pros:

  • Very low noise
  • Very powerful for a 6-inch fan
  • Fully serviceable bearings
  • Small footprint and lightweight
  • Budget friendly compared to competitors

Cons:

  • Blades are somewhat lightweight and feel flimsy
  • Outlet is not included for added cost

3-Speed, 50/25/25 Watts, 6 Inch x 10 Inch, 9-Blade (VSIFAN0610).

If you want a brand you can count on for dependability and durability while saving a few bucks in the process, look no further than the VIVOSUN 6" Inline Duct Fan.

We've reviewed this fan exhaust before, and it's made the list again because of the multiple quality and performance factors it has to offer.

9. Hydrofarm ACDF10 Active Air 760-CFM in-Line

Our rating: 8 / 10

Hydrofarm ACDF10 Active Air 760-CFM in-Line

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Pros:

  • Powerful fan
  • Easy to clean
  • Effective in circulating air
  • Durable construction; can resist rust
  • The motor is non-compromised by the fan blades

Cons:

  • Blade is tiny for the size of fan
  • The fan is not very quiet
  • Does not come with a wire guard

If you’re looking for a truly effective way to improve the environment of your grow room, then this is the ideal fan for you. The Hydrofarm ACDF10 Active Air 10-inch fan is a great way to improve humidity control, air circulation, and temperature in your grow room, without sacrificing quality. It also comes with a number of additional features to make sure it can be used in a number of environments for a variety of purposes.

One of the advantages of this fan is that the motor is completely shielded from any contact with the fan blades, so there is no chance of anything getting inside and causing damage. It is also UL listed, so you can be assured that the fan is up to safety standards. This fan also includes a 90-degree cord, to prevent it from kinking or being damaged in any way.

10. Hydrofarm Active Air ACDF12 969 CFM in-Line Duct

Our rating: 8 / 10

Hydrofarm Active Air ACDF12 969 CFM in-Line Duct

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Pros:

  • Low noise level of 75db
  • Great for hydroponic grow rooms
  • High CFM
  • Easy to install
  • Lifetime warranty

Cons:

  • A bit expensive
  • Sometimes overheats and won't turn off

Growing your plants hydroponically can save you tons of money, but you must grow the plants in a room with good light conditions. With good light comes good heat.

In order to keep humidity at bay and keep temperatures at a reasonable level, a fan is the necessary equipment. When it comes to fans, Hydrofarm has developed an anti-vibration fan that circulates air throughout your hydroponic grow room.

The anti-vibration fan from Hydrofarm is made up of a structural foam housing that dissipates the fan’s vibration in a large area. Along with featuring a low noise level, the fan’s structure and design ensures the safety of your plants.

11. iPower 12 Inch 1060 CFM Inline Duct Ventilation Fan HVAC Exhaust Blower

Our rating: 6 / 10

iPower 12 Inch 1060 CFM Inline Duct Ventilation Fan HVAC Exhaust Blower

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Pros:

  • Quiet
  • Durable
  • Low amp draw
  • Gets rid of heat and humidity
  • Works with your existing wiring

Cons:

  • Only works with 12v systems
  • No speed control
  • No timer

The iPower 12 inch 1060 CFM inline duct fans are great for both your grow room and your home. They are perfect for venting your grow room or your basement, and will get rid of any hot air and humidity.

You will need to use an additional cord in order to plug the fan into your wall. You can use a cigarette lighter plug if you want to run it off your car battery, although it is not included in the package.

The box comes with everything you need to get started. You will get the vents, hangers, screws, and the fan. You will also receive an instruction guide to go through if you are not sure how to set the system up.

Frequently Asked Questions (FAQ)

What is the quietest inline fan?

To determine which inline duct fan is the quietest, we measured the decibels of each fan. These decibel readings were then added together to determine the total noise output of each fan. All levels showed an increase in noise levels as the fan speeds were increased.

The inline fan with the least amount of noise output was the Maxxima Inline Duct Fan CFM 3440. This fan operates on a flow velocity of 280 ft/min, offering the perfect balance between airflow and noise levels. This fan had the lowest noise output of the three we tested, averaging 49.2 decibels.

How often should I exhaust my grow room?

It depends on how many plants are in your growroom, as well as the size of the room. As a rule of thumb, you should exhaust the grow room before the plants are fully mature.

Only once the buds are ready to be harvested do you really need to lock in the space. The highest levels of air exchange are required during the first two to three weeks when the plants are still growing their vegetative stage. At this phase, it’s important to give the plants as much fresh air as possible to kick start the process of strengthening the cell structure. This is especially important for seedlings.

Note: Use an inline fan with your exhaust system to increase air exchange.

How big of a fan do I need for my grow room?

You will need to choose the right fan size for your plants and your grow room. The basic requirement is that a fan must cool the entire area. If you use a smaller fan for a large space, the leaves in the hot parts will be exposed to a lot of heat. That doesn’t spell well for their health. The right arrangement of fans will allow for air circulation in all nooks and crannies of the grow room.

As far as the size of the fan, the wattage rating doesn’t necessarily tell the whole story. Even garden fans sold at hardware stores are durable and efficient. Smaller fans are easier to carry around and therefore are typically preferred for indoor gardening. Although larger fans are meant for bigger outdoor spaces with higher space requirements.

How do you install an inline fan in a grow room?

When choosing an inline fan, make sure you do the following:

  • Look for a fan that is made specifically for growing
  • Select a fan with washable filter

{1}. Consider how the fan will be mounted to the grow room.
{2}. Measure the space where the fan will fit.

If you are building a grow tent for growing marijuana, or a room for your medical marijuana, here are the best inline fans for growing weed in 2021.

Conclusion

For growers living in hot climates, it’s crucial to use inline fans to move air through grow rooms. And to help you make a choice on what to buy, we researched a number of different models and tested their performance. The best inline fan for growing marijuana is the Phresh Hybrid 8. If you’re looking for something that is efficient in moving a lot of air at a reasonable price, we like the Phresh.

Our Recommendation

NameCategoryProduct
Hydrofarm ACDF6 Active Air 6" InlineBest OverallHydrofarm ACDF6 Active Air 6" Inline
VIVOSUN 6 inch Inline Duct Fan 240 CFMBudget PickVIVOSUN 6 inch Inline Duct Fan 240 CFM
Hydrofarm Active Air ACDF12 969 CFM in-Line DuctUpgrade PickHydrofarm Active Air ACDF12 969 CFM in-Line Duct