Best Inline Fan For Grow Tent, Marjiuana

If you are in a hurry and just want to find out what the best inline fan for grow tents is, then we recommend the AC Infinity Cloudline T6 as the best one.

If you are planning on growing some Cannabis in an indoor area, an inline fan is one of the tools that you will need in order to create a healthy environment for your plants. Although weed is a hardy plant indeed, it still requires fresh air like any other. We will review some of the essential information before we attempt to find the best inline fan for grow tent operations and other indoor grow-ops.

Here are the grow tent inline fans we’ll be reviewing:

Let’s begin by addressing the critical information that you will need to make use of an inline fan for your grow tent. After all, you should never open up your wallet unless you know what you are buying. 

A plant growing structure with a neon sign that read "Quality Drugs"

What Are The Advantages Of A Grow Tent?

A grow tent is ideal in many ways for the home grower. First of all, using a grow tent means that you don’t have to dedicate an entire room to your garden. You can take a grow tent and put it in the corner of a large room, or perhaps in your garage. 

Portability is another advantage. If you ever need to move your plants or get rid of them in a hurry, a grow tent is much quicker and easier to dismantle than a traditional setup. 

Easy setup is another advantage. Any good grow tent should contain all the ports and parts that you need. This is pretty important for the selection of your inline fan because you need to make sure to buy a fan that will fit your grow tent. Finally, grow tents are great because they do a great job of keeping out bugs. 

Why Do I Need An Inline Grow Fan?

Plants are not normally able to grow in tightly enclosed spaces. Although plants do not breathe in the same way that we do, they still require fresh air. Most people know that plants use a process called photosynthesis to turn carbon dioxide into oxygen. This is how plants are able to derive energy from sunlight.

What you may not know is that plants have a respiration cycle just like any other living organism. By using the respiration process, the plant takes the energy that it has gathered from the sun and the soil and process it into usable energy. Plants release water vapor and carbon dioxide as a by-product of this process.

Under distant foliage, one hand extends a joint to another hand

This means that your plants can suffocate on their CO2 if left in a confined space for too long. It also means that water vapor will build up on the inside of your grow area, which could cause other problems. This is why a grow-tent must have adequate ventilation to the outside. 

What Should I Look For In An Inline Fan?

The first thing to do is look at the CFM rating of the grow room exhaust fan. CFM stands for “Cubic Feet per Minute.” This will tell you how much air the fan can cycle in a single minute. This number is very important. 

To determine the right size fan for your grow-tent, you will need to figure out the square footage of your grow tent. A lot of tents will tell you the area of the tent on the packaging, and so this part might be easy. If not, get out the measuring tape and multiply the length by the width (in inches). Take the resulting number and multiply it by the height. You could also use this handy online calculator,

This number will tell you the maximum CFM rating that you will need. Take the square footage of your grow-tent and divide it by two to find the minimum size.

You should also look at the diameter of the opening on the fan. This will determine the size of the duct that you can connect. For a grow tent, you will need to make sure that your fan is not too large for the ventilation openings. If it’s slightly too small, you can tighten it up with a rubber band or two. 

You should also consider how noisy this fan is likely to be. Larger fans are always louder, but if you find one that offers precise speed adjustment, you can hold down this factor with precise adjustment. In general, high-quality fans tend to be made in such a way as to absorb sound and run more quietly. 

A Few Tips To Get The Most Out Of Your Inline Fan

  • You can soundproof your fan to dull the noise. You can use many different materials for soundproofing, but make sure that you don’t obstruct the flow of air in any way.
  • Try to get a fan in the upper half of your required range. Not all fans perform as advertised, so never go with the minimum.
  • Plastic fans are less durable, but they tend to be quieter.
  • It is best to combine a grow tent exhaust fan with a carbon filter to remove dirt and debris.

iPower 6 Inch 442 CFM Inline Ventilation Fan

This is one of the more powerful inline fans I’ve seen. This model is well-suited for the larger tents. For instance, a 7x7x7 tent would require 343 CFM. The thing is, very few grow tents are this big. This fan is made from a mix of metal and plastic, and the outside is coated with ceramic. Although this is a pretty loud fan, its construction seems to do a good job of keeping the noise at a minimal level. It also has a permanently lubricated bearing so that it will require no maintenance. The iPower weighs a little over 13 pounds, so it’s a little bit cumbersome to hang. Still, this is a great fan if you happen to need one this large. 


  • Very powerful
  • Sturdy composite construction
  • Quiet in line fan for its size
  • Intake is not open


  • Cord is only five feet long
  • Too large for most grow tents

>> Check Price On Amazon<<

VIVOSUN 6 Inch 440 CFM Inline Ventilation Fan

This is another relatively large fan, which is probably too big for most grow tents. The most distinctive thing about this fan is the fact that it is wrapped in black leather. Although appearance doesn’t matter for a product of this type, it does look cool while providing longevity and durability. The centrifugal impeller that lies at the heart of this device is meant for maximum power with minimal sound. Since they managed to keep it below the 50-Decibel level, I would say they did a decent job. 

Underneath the leather, every part is made of galvanized steel. If you don’t know, galvanized steel is coated with zinc so that it won’t rust. This is likely to increase the lifespan of the fan. The speed controller is another good bonus so that you can dial the fan to the appropriate power level. 


  • Looks really cool
  • Everything is galvanized
  • Relatively quiet
  • Speed control


  • Too large for most grow tents
  • No warranty as far as I can tell

>> Check Price On Amazon<<

Goplus 4″ 118CFM Inline Fan

This one is a little more light-duty. You can certainly notice this fact when you notice the construction of this fan. The housing and blades are plastic, and it doesn’t appear to be all that thick. It does appear to be a durable plastic that can flex a little bit to avoid breaking, so that helps its durability somewhat.At only five pounds, this thing is incredibly light for a fan of this speed. As such, it is very quiet and runs with no noticeable rattle. It has a speed controller as well, but even when turned up to the maximum this fan stays below 30 decibels. Another nice thing is the stepped-down collar on the end which makes it easier to connect.


  • Very lightweight
  • Powerful enough for most grow tents
  • Made mostly of flexible plastic
  • Very quiet
  • Available with 4-inch, 6-inch, or 8-inch openings


  • Durability is questionable
  • Open intake

>> Check Price On Amazon<<

AC Infinity Cloudline T6

This one might well be described as the cadillac of inline fans. Although it is the most expensive product on our list (by far), it does offer quite a few extra benefits. The main benefit is the ability to completely automate the device. You can program this fan to turn itself on and off at certain times of the day. If you are new to this kind of thing, timed ventilation is a simple way to go. You can also program this fan to be triggered by a certain temperature or a certain humidity level. As you might have figured, this means that the device also functions as a temperature gauge and a humidity meter. 

At 351 CFM, this fan is powerful enough to do the job. It’s a little too much for small grow tents but perfect for mid-size and large tents. One reason for this is the precise speed control, which allows you to adjust it perfectly to your tent. 


  • Extremely durable
  • Can be programmed in many ways
  • Alarm system to alert you if temperature or humidity go outside of tolerances
  • Only weighs about 9 pounds
  • Good for tents of many sizes


  • Pretty expensive

>> Check Price On Amazon<<

Terrabloom 47 CFM 4″ Inline Duct Booster Fan

This is the smallest and most light-duty fan on our list. Right away, we can see that 47 CFM is not sufficient for any but the smallest grow tents. That being said, it might be a good option for those who just want to grow 1-3 plants. Depending on where you live, the law may limit you in this way. For a small fan, this thing does perform well. It runs so quietly that you cannot even hear it from the next room. It’s highly efficient in terms of power usage and comes with a very generous 2-year warranty.


  • Quietest inline fan
  • 2-year warranty
  • 8-foot power cord
  • Bracket for easy mounting


  • Too weak for most grow tents 
  • Not suitable for use with carbon filters

>> Check Price On Amazon<<

Growneer 4 Inch 200 CFM Inline Duct Fan

This is another fan with an outer housing and blades made of plastic, but this plastic is very thick and looks very durable. At about 5 pounds, they have definitel kept the weight down. In terms of power, it’s hard to make a complaint about this one. 200 CFM is a good speed for many grow tents. The speed controller is very precise, unlike some models that just let you switch between three modes. The Growneer model also has tabs that are intended to slide over the ducts for easier installation and removal.


  • Made of very thick plastic
  • Good power level for most grow tents
  • Precise speed adjustment 
  • Intake isn’t open
  • Available in 4-inch, 6-inch, or 8-inch models


  • Doesn’t deal well with hot conditions
  • Not specifically designed for plants

>> Check Price On Amazon<<


Overall, the AC Infinity Cloudline T6 is clearly the best inline fan for grow room operations. While this product does lose a few points for its high price, it gets those points back when you look at its features. The reasons for this are the ability to program the device to very precise specifications, combined with its multi-functional nature. 

You may spend a little more on this one, but you won’t have to buy a humidity meter either. As for the thermometer, you can always use more than one of those. 

All of the fans on this list are of high-quality and should serve you well as long as you stay within their size limits. However, the AC Infinity towers above them so much that there can be no other winner in the end. All of the other models had at least one flaw, while the Infinity had no drawbacks other than its price. We hope that you have learned a few things and that you will now be able to select the best inline fan for your glorious weed cave.

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