Grow Tent Fan

Best Grow Tent Fan

Indoor gardening lets you control many factors affecting your plants. However, it’s not just about putting your potted friends inside your house.

It involves making an artificial yet ideal environment for them.

This includes controlling the air around them. A grow tent fan makes this possible.

Read our Best Grow Tent Fan Review to find out.

AC Infinity CLOUDLINE S4, Quiet 4” Inline Duct Fan with Speed Controller

AC Infinity CLOUDLINE S4 4” Inline Duct Fan

While this is the smallest model under the AC Infinity CLOUDLINE line, the S4 does well like its big counterparts. Despite a 4” duct opening, it can provide and sustain 205 CFM airflow.

Unlike other fans, AC Infinity CLOUDLINE S4 has EC motor which enables it to operate more quietly and use energy more efficiently. In fact, its noise level is only at 28 dB while its power usage is at 21 watts.

Equipped with pulse-width modulation (PWM) technology, you can pick a precise fan speed. With eight different fan speeds, it’s still better than those with just one to three options.

Sometimes, however, the drawback in having a wide range of fan speeds is that you can’t remember the optimal speed you’ve set previously. The S4 model solves such problem by having a power cycle memory feature. Feel at ease even if you turn it off for a few hours and then switch it on. The speed you’ve set earlier will kick off without further manipulation.

AC Infinity provides all the mounting hardware and user manual along with its fans. If you’re a beginner at indoor gardening, you might want to check its CLOUDLINE S4 model out.

As for the maintenance, you don’t have to clean that much because the fan is resistant to dust and liquid.

However, this fan isn’t as affordable as the other options. It also doesn’t come with a filter so you have to buy it separately. On the bright side, you have more freedom to select a filter instead of sticking with what the manufacturer provides. You can choose either carbon or coco filter.


  • 205 CFM airflow
  • 8 fan speeds with power cycle memory technology
  • 28 dB noise level


  • Slightly higher price for a fan
  •  Doesn’t come with free filter
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VIVOSUN 4 Inch 190 CFM Inline Duct Fan with 4 Inch Carbon Filter Odor Control with Australia Virgin Charcoal

VIVOSUN 8” 720 CFM Inline Duct Fan

With a 720 CFM airflow, VIVOSUN 8” Inline Duct Fan is the most efficient on this list. While its relatively big duct opening plays a role in such advantage, its motor and air carbon filter have more impact. Its motor makes it possible to reach a fan speed of 2450 RPM.

Its accompanying 8” carbon filter is encased with an inner and outer mesh design. The tiny openings from such design boost the airflow. Made with Australian virgin charcoal bed, the filter also purifies the air it takes in. By the time the air gets released into or outside the grow room, the warmth, water vapor and smell are already removed.

The fan comes with a pre-filter that’s replaceable after six months. You may also need to change it after one grow cycle.

However, you might find its 40 dB noise level disturbing.

Its dimensions and weight also limit it as a ground fan for small grow tents. It’s quite bulky with its 37.8” x 12.6” x 12.6” size. The additional cylindrical filter is 8” x 22”. It weighs 30.2 but that also covers the carbon filter.

With its high airflow fan and quality filter, VIVOSUN’s offer is reasonably priced. But, its power usage can cost you more as you use it.


  • 720 CFM airflow
  • Carbon filter equipped with Australian virgin charcoal bed
  • Free pre-filter that’s replaceable every six months


  • Up to 40 dB noise level
  • Bulky design
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iPower 6 Inch 442 CFM Inline Fan Carbon Filter 25 Feet Ducting Combo

iPower 6” 442 CFM Duct Inline Fan Blower

iPower’s offering is complete with fan, filter, duct and control switch.

At first glance, this fan and its other parts don’t look as sophisticated as the others on this list. They’re covered in reflective coating after all. However, this is actually advantageous as it helps maintain the temperature in your grow tent.

Despite a 10” fan case, the duct opening size is only at 6”. Even so, it provides 442 CFM airflow. The main downside though is that it uses 95 watts.

You might also find it loud when it operates with 50 dB noise level.

The 6” x 16” carbon filter is also notable for having Australian virgin charcoal bed. Whether it’s for intake or for exhaust, it can help neutralize the smell in or from your grow room. The free pre-filter requires replacement twice a year.

All in all, this fan and its accessories weigh 33.6 pounds. While the fan’s design is compact, its weight requires ample support before it can be installed on the wall of a grow room. For a small grow tent though, you can set it down on the floor.

However, there’s the risk of burning out the fan motor. To prevent this, the manufacturer suggests that you shouldn’t adjust your controller below 50%.


  • 442 CFM airflow
  • Carbon filter equipped with Australian virgin charcoal bed
  • 3 settings for speed control


  • Fan speed can’t go below 50%
  • 50 dB noise level
  • 95 watts power usage
  •  Heavy weight
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TerraBloom ECMF-100, 4" Inline Duct Fan with 0-100% Speed Controlled EC Motor

TerraBloom ECMF-100 4” Inline Duct Fan

This small yet stylish TerraBloom fan stands out for having a 0% to 100% fan speed range. You can pick the ideal fan speed by turning on its rotary encoder. If you’re not a big fan of such controller, you can upgrade to get the remote control or the thermostat that comes with temperature programming.

TerraBloom ECMF-100 has a 6.5’ cable and 16’ cord for the speed controller. These let you install the speed controller in a convenient location.

It’s also worth noting for using 18 watts and for having a compact design. Weighing only 3.59 pounds, it’s among the most lightweight grow tent fans. However, this may only be ideal for very small grow tents as its airflow is limited to 160 CFM.

The fan’s blades and motor are housed with a rust-proof and an aluminum-coated case. With its metal mount, you can secure it on the floor of your grow space. Even when it’s on the floor, the airflow it supplies can reach farther areas thanks to its dual jet-type propellers.

On low fan speeds, the noise level is around 28 dB which is easy to ignore. However, if you raise it, the sound may peak to 56 dB which is comparable to the loudness of your fridge’s motor.


  • 0% to 100% speed control
  • 18 watts power usage
  • Compact design
  • Extensive cord


  • 160 CFM airflow
  • Up to 56 dB noise level
  •  Doesn’t come with free filter
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TOPHORT 4 Inch Inline Duct Fan 190 CFM Blower Fan with Variable Speed Controller

TOPHORT 4” Inline Duct Fan

TOPHORT 4” Inline Duct Fan is the most affordable option on this list.

Furthermore, this boasts a powerful motor that guarantees 2500 RPM fan speed. It also ensures a 190 CFM airflow which is quite high for a fan with a 4” duct opening.

If you’re only growing two potted cannabis, this fan may be enough for you. However, you need to consider a more powerful fan in case you have three or more plants in your grow tent.

Its 32 dB noise level is tolerable, too.

In terms of energy efficiency, though, this one tends to fall behind with its 60 watts power usage. So, while it’s sold at a low price, you’re bound to pay more in the long run due to its high electricity usage.

This fan is mostly made from plastic. As a result, it only weighs 5.04 pounds. Being lightweight and having removable duct ends make it easy to assemble and to remove for cleanup. However, it may not be the most long-lasting of the bunch.

If it weren’t for its high wattage, you could get few of this fan and install them on the wall of a sizable grow room.

As for its motor, it only needs minimal maintenance as it’s permanently oiled.


  • 190 CFM airflow
  • 32 dB noise level
  • Lightweight
  • Affordable


  • 60 watts power usage
  • Doesn’t come with free filter
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What Does a Grow Tent Fan Do

Grow Tent Fan

Imagine how uncomfortable your home will be without HVAC. Now, think of how your plants may feel while inside a grow tent.

Like us, they also need proper air circulation.

Basically, a fan facilitates air circulation inside a grow room. Such seemingly simple job actually does a lot for your plants. Below are the top benefits of the said equipment.

Supplies Carbon Dioxide

Your plants need light, water and CO2 to make their own food. You can replace sunlight with grow lights and rain with tap water. As for CO2, your fan can collect it outside your grow tent and make it circulate therein.

Gets Rid of Heat

When I first tested the grow lights in my grow tent, I immediately felt how warm they could get. Even without the lamps, just sealing the plants inside a tent is bound to bake or dry them out.

Thankfully, a fan can blow cool air into the grow room and suck the warm air out.

Helps Keep Humidity in Check

Humidity influences how much water and nutrients your plants will take in.

If the humidity levels in your home fall within the 35% to 50% range, you might not need a humidifier or dehumidifier in your grow room. An indoor grow fan may be enough.

But still, make sure your grow tent has a monitor for both temperature and humidity.

Helps Prevent Pests and Diseases

A fan can prevent dampness on the top soil. By doing so, it slows down the reproduction of some pests.

As it manages temperature and humidity, it also thwarts mold growth.

Controls Possible Wind Stress

Outdoor plants are constantly subjected to wind stress. Some bend and end up not surviving. However, those that withstand grow on to have stronger stems. Such stems help them carry their fruits later on.

With a grow fan, you can induce wind stress to your indoor plants.

What Factors to Consider When Choosing a Grow Tent Fan

Grow tent fans aren’t all the same. They’re made for different growers, plants and grow rooms. The following are the main factors you should consider before buying one.

Right CFM

This refers the airflow that your grow tent needs. Fans are often rated using this.

The first step in determining the appropriate cubic feet per minute or CFM is to compute the volume of your grow tent. It’s basically length times width times height.

(In their packaging, grow tents’ dimensions are often expressed in inches. Convert them first into feet before computing.)

What you get is the base CFM.

However, you also have to factor in the fan components as they can affect the airflow. If yours has a carbon filter, multiply the baseline to 60%. If there’s a 30° bend in your ducting, multiply it to 20%.

Then there’s also the heat from the LED grow lights. Multiply it to 50% to get the final and the appropriate CFM.

The formula is summed up below:

CFM = (Grow Tent’s Length x Width x Height) x (Fan Component Factors) x (Grow Light Heat)

Ease of Setting Up

Aside from blades, motors, power cords and adapters, grow room fans also come with ducts, carbon filters and speed controls. Straightforward designs just need some plugging and securing parts using screws.

Check out their manuals to gauge how easy it is to set them up.


In addition to the switch, your fan has speed controller. Additional buttons are optional and likely unnecessary.

Changing your fan’s speed should be easy. I personally like those with knob-like controllers because they’re user-friendly.

Energy Efficiency

In your grow room, your fan has to stay on for long hours. Having an energy-efficient equipment helps you avoid high utility costs.

Don’t just focus on the power usage though. Some fans may use more electricity but that’s because their airflow is also greater. Meanwhile, there are fans that use less energy but provides low airflow.


Having more control over your plants means you have more things to do.

Aside from your plants, you need to regularly check your equipment such as grow lights and fan.

For your fan, you have to make sure its motor is well-oiled all the time. The blades and ducts should be clean, too.

Many fans come with pre-filters. You have to replace yours every six months or so.

Choosing an equipment with permanently-oiled motor and long-lasting filters can help minimize your chores.

Low-Noise Operation

Even topnotch grow tents may not totally muffle the sound of grow tent fans.

While noiseless options are rare, if not inexistent, you can choose among fans with noise levels ranging from 30 dB and below. A 30 dB is as quiet as a whisper.

Odor Control

If you’re cultivating weed secretly, odor control should be one of your concerns. For this, you need to set up a filter along with the fan. Aside from unwanted smells, the filter gets rid of impurities in the air.

A carbon filter is a highly recommended option.


The materials used in its production help determine the durability of a fan. However, proper use and maintenance still play a role in making sure that it will last for a long time.

What Precautions to Take Before Using a Grow Tent Fan

  1. Check out the operating environment of the fan. The operating environment covers the ranges of temperature and humidity levels that your place should have so the equipment can work at its best.
  2. Make sure it matches with your home’s power supply voltage.
  3. Consider the fan’s dimensions especially if you have a small grow tent. In case you have a big grow room and think of installing the fan on the wall, take into account the weight of the equipment.
  4. Stock up on cable ties. Use them to organize and secure wires and cords later on.
  5. If you can’t tolerate even 30 dB noise levels, you should get a silencer. However, you should factor this in your computation for the airflow.


All in all, the aforementioned fans help you set up and sustain the optimal environment for your indoor plants. If I were you, though, I will pick AC Infinity CLOUDLINE S4 for a small grow tent especially if it’s your first time to use a fan or if you’re not satisfied with your previous purchases. It’s slightly more expensive than others, but what you get is a grow tent fan that provides higher CFM airflow despite having a narrow duct opening. At the same time, it has relatively low wattage and operates more quietly than the rest. In the long run, it’s more cost-effective. It’s also noteworthy for being easy to assemble, use and maintain.

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