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7 Best Inline Fans for Grow Tents 2021 – Reviews & Top Picks

Last updated: April 12, 2021

Best In Line Fan for Grow TentInline fans are one of the most underrated accessories for a grow, in the sense that they aren’t considered necessary but they open up new options that wouldn’t otherwise be advised.

Mainly this concerns stuff like countering heat problems from stronger lights or the humidity and CO2 concentrations that come up when dealing with multiple plants in an enclosed space.

Inline fans, for these reasons and more, need to be reliable and produce a consistent and strong current. Finding the best of these can be a chore, so we’ve created some reviews to cover some of the better ones we’ve found in our search.

Let’s check it out.


A Quick Comparison of Our Favorites

Image Product Details
Best Overall
Winner
iPower GLFANXINLINE4 Inline Duct Ventilation Fan iPower GLFANXINLINE4 Inline Duct Ventilation Fan
  • Reliable workhorse
  • Very consistent air circulation
  • Best Value
    Second place
    VIVOSUN Inline Duct Ventilation Fan VIVOSUN Inline Duct Ventilation Fan
  • Budget-friendly
  • Compact
  • Nearly silent
  • Premium Choice
    Third place
    Hurricane 736570-1 Inline Fan Hurricane 736570-1 Inline Fan
  • Very powerful
  • Easy to install
  • Long cord
  • AC Infinity CLOUDLINE T4 Inline Duct Fan AC Infinity CLOUDLINE T4 Inline Duct Fan
  • Built-in humidity meter and thermometer
  • Reliable
  • TerraBloom ECMF-100 Inline Fan TerraBloom ECMF-100 Inline Fan
  • Highly adjustable
  • Very quiet and reliable
  • The 7 Best Inline Fans for Grow Tents – Reviews 2021

    1. iPower GLFANXINLINE4 Inline Duct Ventilation Fan – Best Overall

    iPower

    A well-built reliable inline fan that does a good job circulating air over a long period, with the caveat of a few noise issues, and it comes with an only 5-foot cord.

    Other than that, though, this is a workhorse that will get the job done over the course of multiple grows. The wire can be extended with any number of extension cords, and the 5-foot cord should technically be enough for a lot of grows.

    Noise reduction is a weird thing to skimp on, but the rest of the unit more than makes up for it, as long as you’re not looking for the ultimate in stealth grow technology. It’s not loud by any means, but you can hear it when the door is closed.

    Pros
    • Reliable workhorse
    • Very consistent air circulation
    Cons
    • Short cord
    • A bit noisy

    2. VIVOSUN Inline Duct Ventilation Fan – Best Value

    VIVOSUN Inline Duct

    An effective and compact fan that lacks a bit of the power of more robust models, but is surprisingly reliable for the price. Depending on the amount of space it’s working on, this may be the best inline grow tent fan for the money.

    It comes with a cord that is just under 6 feet, so longer than the iPower one at least, and is built for simple installation. One of these should be able to handle a small grow tent just fine, but for setups with more than two plants, an additional fan might help out with things.

    Overall, it’s a good fan at a great price, but if you’re looking for a single inline for a medium-sized grow, it might lack a bit in power. Furthermore, it’s virtually silent so stealth is much more possible with a fan like this.

    Pros
    • Budget-friendly
    • Compact
    • Nearly silent
    Cons
    • Lacks a bit in power
    • Two may be required for medium-sized grow tents and larger

    3. Hurricane 736570-1 Inline Fan – Premium Choice

    Hurricane

    The CLOUDLINE T4 is an easy to install yet powerful industrial inline fan that isn’t exactly the cheapest on the market, but it moves air better than most things we’ve seen. It’s fairly quiet, somehow, to boot.

    AC Infinity makes a high-quality product, and if you want to shell out the extra cash, then it actually is money well spent. This particular fan pumps a lot of air, has a nice long 8-foot cord, and isn’t silent, but is definitely not loud, either.

    This is all that’s required for extra air circulation in a medium-sized grow, and may even be a bit overkill for a smaller one. Now that we have one, we love it, but it shouldn’t be the first thing you spend money on in a grow.

    Pros
    • Very powerful
    • Easy to install
    • Long cord
    Cons
    • A bit of noise
    • Expensive

    4. AC Infinity CLOUDLINE T4 Inline Duct Fan

    AC Infinity

    An inline fan full of a ton of features, but lacks a bit of output compared to others of the same price. The humidity meter and thermometer, however, work great. It’s also quite reliable and seems to run forever.

    This is actually a great addition to most setups due to all the bells and whistles this has on it, if you don’t already have a thermometer and humidity meter at least. The fan itself, however, is really only suitable for smaller grows.

    It should be used in conjunction with another fan if on a medium-sized or larger grow, as the fan really doesn’t have a lot of get up and go to it. However, it does seem to be quite reliable and we do like using it to add a bit of extra airflow and get some readings.

    Pros
    • Built-in humidity meter and thermometer
    • Reliable
    Cons
    • Expensive
    • Not much air output

    5. TerraBloom ECMF-100 Inline Fan

    TerraBloom

    TerraBloom has created a “smart” fan capable of easy adjustments via a smartphone with very low noise and a light-weight design, but lacks air output compared to less fancy fan systems.

    It’s an interesting inline fan but the extra smart tech doesn’t really add a whole lot, compared to just handling the controls yourself. The amount of customizability you have to the output is really nice, though, but the max output leaves a lot to be desired.

    For a smaller grow tent—if you don’t mind spending a bit extra on some fancy bits—it’s actually a very reliable and quiet fan that will last for a long time. There just seems to be better options at this point, especially if you’re going to spend this much on one.

    Pros
    • Highly adjustable
    • Very quiet and reliable
    Cons
    • Not much use for the smart tech
    • Low air output despite the customizability

    6. Hydrofarm ACDF4 Active Air Inline Fan

    Hydrofarm

    The Hydrofarm ACDF4 moves a lot of air, but is also quite loud and doesn’t seem to really offer much else despite the hefty price tag. It’s a quality product, no doubt, but grabbing an inline that makes less noise while producing the same amount of air is entirely possible within this price range.

    All this being said, we like the fan. It just seems like the Hurricane 736570-1 Inline Fan offers the same benefits at a similar price point, with quite a bit less noise. This is a loud fan and really doesn’t suit itself well for a grow room trying to maintain a semblance of quiet.

    However, it does operate quite smoothly and seems to be of high build quality. We didn’t stick with this one because we prefer a quiet environment, but it could be the choice when airflow is all that matters.

    Pros
    • A lot of airflow
    • Well-built and reliable
    Cons
    • Noisy
    • Expensive
    • Doesn’t offer anything others don’t at the same price

    7. VIVOSUN 6 Inch Inline Duct Fan

    VIVOSUN

    This particular VIVOSUN fan packs a lot of punch in a fairly inexpensive package but lacks the reliability we expected from their other products we’ve used.

    This still makes the list because the customer service for this product was top notch. However, our use of it aligns with others online, in that it is quite impressive until it breaks down. Ours lasted two months, not quite an entire grow.

    However, we were very impressed with both the air circulation and the lack of sound this product produced. So, needless to say, it was disappointing to see it break down on us so quickly.

    Your mileage may vary, but VIVOSUN replaced our product fairly easily. We should note: the new one is currently still working. Still, it brings into question the reliability for new growers and for that, it hits that bottom of the list.

    Pros
    • Very quiet
    • Surprisingly powerful
    Cons
    • Brokedown on us after 2 months
    • Questionable build quality

    Buyer’s Guide

    Inline fans move air throughout a room, which seems fairly simple, but there are a few things to consider before making a major purchase on one of these. You’ll need to consider the space it will be operating in, compared to the total investment into your grow area.

    Power Cord

    It’s a bit of an odd thing to focus on when making an important purchase, however, a lot of fans, despite being of good quality, tend to have fairly short cords. This means you need to prepare a bit depending on the number of sockets in the area around your grow area.

    Purchase an extension cord alongside your inline fan if you’re going to need to reach a socket that is far away, as it’s generally not a great idea to overload a single circuit with a GFI splitter. This is more of an electrical concern than something specific to inline fans, but when adding heavy equipment like this it’s important to note.

    Air Circulation

    Depending on the size of your grow tent, you need to consider how much airflow you want. Generally, you can’t go too hard with this, but some of the more powerful fans mays be a bit of overkill for a tiny space.

    You don’t want your cannabis plants to feel like they’re in a perpetual wind tunnel. Aim for a gentle breeze that keeps the air circulation and allows the temperature to cool down, but not something that is blowing the plants sideways constantly.

    It should feel nice, if humid, in your grow tent. Your plants like nice weather.

    Reliability

    Air circulation is an important key to keeping plants healthy, and if you’re relying on an inline to keep the environment ideal then one conking out in the middle of a grow can be a near disaster.

    Look for products made of quality metals, no plastic blades, and come with warranties that their manufacturers back up. They only give out good warranties if they back their product and worst-case scenario you can quickly swap out the product, instead of worrying about your plant’s health.

    Conclusion

    Inline fans are the unsung heroes of successful cannabis grows and should be treated with just as much caution in purchasing as any other part of the setup. Reviews can only help so much with this, as each individual grow tent needs a specific solution depending on a lot of different factors.

    However, for most small to medium tents our number 1 pick, the iPower GLFANXINLINE4 Inline Duct Ventilation Fan, tends to handle the needs of being on all the time while producing a fair amount of circulation very well. Also, the price is below other fans of the same caliber. The only issue being noise.

    If you’re looking for something that is capable of producing a decent amount of airflow, while staying quiet, then take a look at the VIVOSUN Inline Duct Ventilation Fan. It works on the floor or up high and manages to be very reliable while producing a fair amount of circulation, all at a budget price.

    It can be difficult to get through all the reviews and confusion online about this specific aspect of a grow. Choosing a good fan is important, and we hope this helped somewhat getting to the bottom of this issue.


    Featured Image Credit By: iPower Inline Duct Ventilation Fan, amazon