Grow Room Ventilation

Ventilation is one of the most vitally important things when it comes to growing healthy plants indoors. Cannabis plants need a certain amount of oxygen and carbon dioxide in order to grow healthily, as well as light and water – without any one of these, you simply can’t grow cannabis, or any other kind of plant for that matter – they need all of these ingredients for photosynthesis. That’s why grow room ventilation is incredibly important for your cannabis plants’ (or any other indoor plants’) health.

In order to give your indoor cannabis plants enough oxygen and carbon dioxide, which they definitely need in the right amounts, you need to set up a ventilation system which usually involves an extraction fan, which is used for two main reason. One the one hand they’re used to bring new, clean air into your growing space and on the other hand they’re used to get rid of stale air.

grow room ventilation

Grow Room Ventilation Benefits

When using extraction fans and intake fans in your grow room you’re actively preventing a handful of issues that can be devastating to your plants, such as insects and fungi. You should probably also use a few fans in your grow room in order to keep that fresh air moving and so that the stale air doesn’t end up sitting in the corner.

grow room ventilation

Fans also stop air from layering up in your grow room, which can make it hard for carbon dioxide to distribute itself evenly and some plants may not get any. On the other hand it also helps to prevent different types of fungi and pests from getting to your plants.

Here’s a quick list of all of the benefits of having a decent ventilation system in your grow room:

  • Fresh air rich in CO2 and O2
  • Gets rid of stale air
  • Gets rid of extra heat
  • Stops air pockets from forming
  • Stronger, healthier plants
  • Better developed plants
  • Plants that feed more
  • Improves the process of evotranspiration

What type of extractor fan should you use for grow room ventilation?

grow room ventilation

In order to know the exact type of extractor fan that you need for your grow room you’ll have to do a little bit of simple math regarding the area that you’re growing in. You’ll need to first work out the square meterage of your grow tent or room.

In order to do that, all you have to do is measure the length, width and height of the room or grow tent and then multiply them.


  • If your room is 3m long, 2.5m wide and 2.7m tall, then the sum that you’re looking for is 3×2.5×2.7, which is 20.5 – your grow room is 20.5m square!
  • Once you’ve worked out the square meterage of your grow room, you’ll need to multiply this number by 60, the amount of minutes in an hour. So, it should look like this 20.5×60 = 1,215.

The result we obtained here is 1,215, which means that you’ll need a 1215m3/h extractor fan in order to keep the room fresh.

If you want to use a smaller extractor for whatever reason, or maybe you have one that isn’t strong enough and want to add another, you can do the exact same equation; just reduce the 60 to 30 for half an hour.


  • Using the same numbers as before, take your 20.5m3 and multiply it by 30 minutes – 20.5 x 30 = 615 m3/h.

The resulting extractor fan is the minimum strength that you can use in that particular room for efficient results.

What type of supply fan should you use for grow room ventilation?

It’s much easier to figure out what supply fan you need now that you’ve chosen your extractor fan – simply divide the strength of your extractor fan in four and you’ve got it.


  • If your ideal extractor is 1215m3/h, then you need to divide that by 4 – 1215:4 = 303 m3/h.

There you have it, that’s the exact supply fan that you’d need (if you wanted to use one) for your indoor grow room, assuming it’s the exact same size as the one we’ve used in our examples.

Extractor Fans for Growing Cannabis |

When picking the right extractor fan, you’ll need to keep in mind the results obtained using the equation, and then you’ll need to do your homework – there are loads of different types of extractors that have varying qualities and characteristics. Let’s have a look at the different types of extractor fans that we work with here at – you can find all of these fans on our page and in our retail stores.

Extractor fans for grow tents

tt vents extractor fan

2 Speed TT Vents Extractor Fan

These types of extractor fans are generally used in small grow tents, although they can also be used as a little extra help in larger growing rooms that already have decent extraction fans – you can add it on halfway down the tubing. These types of fans do not have great suction, so you can only use very weak carbon filters if you don’t want the pressure to drop significantly.

One of the great things about this model is the fact that it can be used with or without the reducers that it comes with, plus its two-speed setting, which is incredibly helpful. These particular characteristics make it ideal for vegetation grow tents, maintaining mothers or rooting clones.

VK Tubular Vents Extractor Fan

grow room ventilationThis is a great choice for growers that don’t have a big budget when it comes to their extractor fan; this particular fan has a great flow and suction, although due to its plastic covering it generates quite a bit more noise. You can solve this issue with a soundproofed box.

It’s made out of incredibly lightweight materials, which makes it super easy to install in pretty much any grow tent or grow room. This particular model has strong suction given how light and affordable it is.

Extractor fans for small grow rooms

rvk indoor extractor fan

RVK System Air Extractor Fan

This is without a doubt one of the most used extractor fans in this sector; it was one of the first ever models on the market, and it still provides amazing results, lasting practically a lifetime. This extractor is quite potent, allowing you to easily work with a carbon filter – as long as it’s the right m3 flow.

One of the best things about this particular extractor fan is the fact that it hardly makes any noise at all. If you use it with soundproofed ducting you’ll have an almost perfectly silent ventilation system. RVK have class A and class L extractor fans; L models are much more potent. If you’re looking for a potent extractor fan for your grow tent or room, this is a great place to start.
grow room ventilation

WK Metal Dospel Extractor Fan

If you’re looking for a strong extractor fan, these WK Metal models are ideal. They’re made out of incredibly strong materials, meaning they’re quite sturdy and generate a lot less noise than plastic models of the same kind. This particular model is generally chosen by growers that are looking to control the ventilation in a grow room with 4-6 lights without needing to use a supply fan or professional extractor. You can install stronger carbon filters using this extractor fan thanks to its strong flow.

Extractor fans for large grow rooms

iso max extractor fan

ISO-MAX Soundproofed Extractor Fan

Now we’re starting to talk about professional-grade extractor fans that are made out of incredibly high quality materials. The ISO-MAX extractor fan stands out thanks to its incredible design, which essentially traps all noise made by it inside its soundproofed covering. On the other hand, its suction power is incredibly potent, which makes it perfect for grow rooms and large green houses.

It has three different speeds and it automatically turns off in case of overheating. If you’re looking for the most powerful, discreet extractor fan for your large grow room, this one is perfect. Add some soundproofed ducting for even better results.
grow room ventilation

Soundproofed Wooden Box Extractor Fan

The strongest and most efficient extraction systems currently on the market are wooden box extractor fans. They offer amazing suction power and make almost no noise at all thanks to the special noise cancelling foam on the inside of the box. These boxes may look a bit bulky at first but there are really no better models than these particular types of extractor fan.
They are ideal for cooling down and freshening up large grow rooms and greenhouses. In order to install it properly and professionally you will need takeoff collars and clamps to stop the vibrations from moving through the walls.

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