The inline fan is a very important tool for indoor gardens and grow tents. However, there are countless models available on the market, how can you know which is the best inline fan for grow tents? No worries, though, we have compiled a complete guide to show you what factors should be taken into account.
Here are the best inline fans for grow tent you can buy in 2025:
- Most Powerful (6-Inch Inline Fan): VIVOSUN 6 Inch 440 CFM Inline Duct Ventilation Fan
- Quiet (6-Inch Inline Fan): TOPHORT 6 Inch Inline Duct Fan
- Compact (6-Inch Inline Fan): TerraBloom ECMF-150
- Quietest (4-Inch Inline Fan): VIVOSUN 4 Inch 190 CFM Inline Duct Fan
- Easy To Install (4-Inch Inline Fan): calimaero 4 Inch Inline Fan
- Best For Blooming Stage (4-Inch Inline Fan): iPower GLFANXINLINE4
| 6 Best Inline Fans For Grow Tent | ||
|---|---|---|
Most Powerful | VIVOSUN 6 Inch 440 CFM Inline Duct Ventilation Fan
| |
Quiet | TOPHORT 6 Inch Inline Duct Fan
| |
Compact | TerraBloom ECMF-150
| |
Quietest | VIVOSUN 4 Inch 190 CFM Inline Duct Fan
| |
Easy To Install | calimaero 4 Inch Inline Fan
| |
Best For Blooming Stage | iPower GLFANXINLINE4
| |
6-Inch Inline Fan
Most Powerful (6-Inch Inline Fan): VIVOSUN 6 Inch 440 CFM Inline Duct Ventilation Fan
- Powerful for optimal ventilation – air flow of 440CFM
- Relatively quiet for the power - fine-tuned construction & solid leather cover
- Durable and corrosion-resistant - steel alloy
- Variable speeds don’t adjust enough
- Not ideal for small tents with 6” openings
This inline fan is amazingly powerful. It can reach a maximum speed of 2450 RPM for 440CFM airflow while the noise can’t be lower, especially if compared to other similar counterparts.
Want to know the secret?
Well, it not only lies in the fine-tuned construction but also the added cover made from sturdy vegan leather for vibration-absorption enhancement.
The galvanized corrosion-resistant steel alloy, meanwhile, is key to extend its durability to the extreme.
| VIVOSUN 6 Inch 440 CFM Inline Duct Ventilation Fan Specifications | |
|---|---|
Material | Pu leather |
Speed | 2450 RPM |
Air Flow | 440 CFM |
Noise Level | 50 dB |
Highlight Features | airflow of 440 CFM fine-tuned construction & solid leather cover steel alloy a maximum speed of 2450 RPM |
The power of VIVOSUN 6 Inch 440 CFM Inline Duct Ventilation Fan is among the best tested.
Quiet (6-Inch Inline Fan): TOPHORT 6 Inch Inline Duct Fan
- Incredibly quiet – the noise level of under 34 decibels
- Powerful and easy to adjust the speeds – deliver 2400RPM speed & fan speed adjustments
- Easy to assemble - locking tabs & detachable duct ends
- Ideal for busy users – low-maintenance motor
- A bit tricky to keep the duct secure to the outlet
While offering powerful 390CFM airflow and 2400RPM speed with various adjustments, we are pleasantly surprised by the quietness of this inline fan.
In most settings, the noise is always under 34 decibels, which is suitable for not just growing tents but also households and more.
Another thing that we think busy gardeners will love is its low-maintenance motor. And the good news for beginners is that it’s also easy to set up, thanks to the detachable duct ends with locking tabs.
| TOPHORT 6 Inch Inline Duct Fan Specifications | |
|---|---|
Material | plastic |
Speed | 2400 RPM |
Air Flow | 390 CFM |
Noise Level | <34 dB |
Highlight Features | the noise level of under 34 decibels deliver 2400RPM speed & fan speed adjustments locking tabs & detachable duct ends low-maintenance motor |
If you hate noisy inline fans, especially when visiting your grow tents, then the TOPHORT 6 Inch Inline Duct Fan might become your favorite pick. It’s extremely quiet!
Compact (6-Inch Inline Fan): TerraBloom ECMF-150
- Perfect for smaller grow tents – the measurement of 7.3 x 6.5 x 6.9 inches
- Durable and reliable - PX4 ingress protection rated structure with rust-resistant coated steel cover, ETL listed, and a 2-year warranty
- Energy efficient - dual jet type blades and brushless EC Motor
- Expensive
For smaller grow tents, this inline fan is a great selection due to its 350FM airflow and compact design – measured 7.3 x 6.5 x 6.9 inches. But don’t let its modest size fool you about its durability or performance.
Thanks to the IPX4 ingress protection rated structure with rust-resistant coated steel cover, it can last a lifetime with low-maintenance requirements.
Regardless, it meets ETL standards and is backed by a 2-year warranty.
But the best part is its energy efficiency – consuming only 40 Watts at maximum speed. Even at lower settings, the dual jet type blades and brushless EC Motor won’t waste your electricity.
| TerraBloom ECMF-150 Specifications | |
|---|---|
Material | Alloy Steel |
Air Flow | 350 CFM |
Noise Level | 31-60 dBA |
Highlight Features | the measurement of 7.3 x 6.5 x 6.9 inches PX4 ingress protection rated structure with rust-resistant coated steel cover, ETL listed, and a 2-year warranty dual jet type blades and brushless EC Motor |
The TerraBloom ECMF-150 is by far the most compact option in our test that doesn’t compromise its power, durability, or performance.
4-Inch Inline Fan
Quietest (4-Inch Inline Fan): VIVOSUN 4 Inch 190 CFM Inline Duct Fan
- It causes nearly no noise while operating – the noise levels of 31 dB
- Enhance indoor air circulation - the 2300RPM speed
- Able to reduce particulates, pungent smell, and undesirable odors - the carbon filter
- A bit costly
- The bracket is slightly hard to remove
Out of the three options we’ve got here, VIVOSUN 4 Inch 190 CFM Inline Duct Fan is the quietest.
Despite the 2300RPM speed, its noise level is only around 31 decibels. That’s why it is perfect for grow tents, grow rooms, greenhouses, bathrooms, and kitchens.
Our most favorite thing about this unit is while improving the interior air circulation, it can reduce particulates, pungent smell, and undesirable odors. That is a big thank you to the additional carbon filter.
But take note to replace this component with everything six months for the highest efficiency.
| VIVOSUN 4 Inch 190 CFM Inline Duct Fan Specifications | |
|---|---|
Speed | 2300 RPM |
Air Flow | 190 CFM |
Noise Level | 31 dB |
Highlight Features | the noise levels of 31 dB the 2300RPM speed the carbon filter |
While packing lots of power, the VIVOSUN 4 Inch 190 CFM Inline Duct Fan runs quietly and also, consumes energy efficiently
Easy To Install (4-Inch Inline Fan): calimaero 4 Inch Inline Fan
- Easy to assemble - no earth cable required & include a two-wire cable 2 x 0.75mm² with plugs
- Ideal for small grow tents - 2550RPM of speed and 70CFM of airflow
- Durable - IPX4 waterproof rated construction & temp ranges of 5 to 40 degrees C
- Very affordable
- No complain
We believe that lots of novice gardeners will fall for this cute inline fan not only because of its elegant design or the insanely low price tag but also the ease of assembly.
You can directly insert it to 4” aluminum ducting and metal ducts with no earth cable required. It also includes a two-wire cable 2 x 0.75mm² with plugs.
Due to its performance – 2550RPM of speed and 70CFM of airflow, it is perfect for small grow tents. Besides, it’s very quiet and low-maintenance.
The IPX4 waterproof rated construction allows this inline fan to work finely in those conditions with temperature ranges of 5 to 40 degrees C.
| calimaero 4 Inch Inline Fan Specifications | |
|---|---|
Material | aluminum |
Speed | 2550 rpm |
Air Flow | 70 CFM |
Noise Level | 32 dB |
Highlight Features | no earth cable required & include a two-wire cable 2 x 0.75mm² with plugs 2550RPM of speed and 70CFM of airflow IPX4 waterproof rated construction & temp ranges of 5 to 40 degrees C |
If you are finding an easy-to-assemble inline fan, the calimaero 4 Inch Inline Fan is our top suggestion.
Best For Blooming Stage (4-Inch Inline Fan): iPower GLFANXINLINE4
- Perfect for bloom cycle
- Optimize garden temp management & pest and odor control – 190CFM airflow, 2460RPM speed, and carbon filter
- Low noise levels - center hub and composite fan blades
- It’s heavy
This is our proud choice for those who want to be serious about gardening and we highly recommend using it during all growth stages, especially during the bloom cycle.
It helps you manage the temperature of your whole garden as well as control odors and pests. Rest assured, its construction is specifically designed to hold up well in most conditions whereas it requires no maintenance at all.
There’s also no vibration or rattle noise while operating, thanks to the center hub and composite fan blades.
| iPower GLFANXINLINE4 Specifications | |
|---|---|
Material | ceramic-coated |
Speed | 2460 RPM |
Air Flow | 190 CFM |
Noise Level | <48dB |
Highlight Features | 190CFM airflow, 2460RPM speed, and carbon filter center hub and composite fan blades |
The iPower GLFANXINLINE4 is for serious gardeners who want to improve their crops, especially during the bloom cycle.
How To Choose The Best Inline Fan For Grow Tent?
Types
The first thing to do when shopping for an inline fan is deciding which type you want to go with.
- Axial inline fan: this is the most common choice for grow rooms, featuring a short length of ducting. These inline fans are good for high extractor fans with low pressure. But they are not suitable for long duct length. You should install these fans with the shortest duct length possible.
- Centrifugal inline fan: this type of fan is made for greater pressure so you can use a longer length of ducting. You can install these fans either horizontally or vertically. They feature durable construction and compact design.
- Mixed flow inline fan: fans of this type balance the benefits of the centrifugal and axial types. They come with unique designs that are more power-efficient while performing just as efficiently. They offer a compromise between air pressure, power consumption, and noise.
Durability
It’s always better to have an inline fan that can last a long time, and durable construction will help you ensure this.
You should opt for a well-balanced construction for minimized vibration, which doesn’t have any wearing components.
If you want a good duction connection you should find a unit with a rubber gasket because it helps eliminate vibration and dampen sound.
Airflow & Cubic Feet
Different growing areas require fans of different sizes, and this is determined by the total cubic feet of your grow tent. To calculate this number, you need to multiply the width by the length and the height of the tent.
For instance, if your grow tent has a width of 4 feet, a length of 2 feet, and a height of 5 feet, its total cubic feet is 4x2x5=40 cubic feet.
This means its inline fan must pull 40 cubic feet of air every minute. Therefore, it requires a 4-inch fan, which can pull 190 cubic feet of air in a minute.
Duct Size
The duct size is normally determined by the cubic feet per minute and velocity. Inline fans are rated for their duct size, like 6-inch or 4-inch.
It’s important to choose the right duct size as under-sizing or over-sizing the duct will affect the performance of the ventilation system.
Which Brands Make The Best Inline Fan For Grow Tent?
VIVOSUN
Founded in 2009, thIs is one of the leading manufacturers and suppliers of indoor horticultural equipment. It’s best known for offering high quality and competitive prices.
TerraBloom
With more than 10 years of experience in the industry, this is another reliable place where you can buy inline fans. Its products are energy-efficient and of high quality.
iPower
Since 2009, this brand has become a market leader in terms of gardening equipment. It focuses on enhancing technology to create the best products for you.
FAQs
Are inline fans better?
Yes, inline fans are great for ventilation in wet spaces.
Do I need a fan in my grow tent?
Yes, you should install a fan in your grow tent to help with moderating humidity and temperature within the growing room.
What size inline fan for 4x4 grow tents?
A 4x4 grow tent may feature 106 cubic feet, so a 4-inch inline fan will do the job.
How many fans do I need in my grow tent?
Ideally, you should get at least two fans of medium size, one of which is put on the ground and the other above the plants.
Should you put a fan on seedlings?
Yes, you should. A fan will maintain good air circulation for seedlings, which helps prevent disease.
Conclusion
Through this post, we hope that you have figured out what to look for in the best inline fan for grow tents at your house. Remember to calculate the total cubic feet of your grow tent so as to get the right fan size. Good luck!
