Systemair RVK Sileo Fans




  • Hugely reputable manufacturer
  • Compact yet powerful hydroponics extraction fans
  • Perfect for extraction systems in hydroponic grow rooms or tents
  • Ideal for intake fans
  • Easy to install
  • Excellent price point for quality
  • Relatively quiet for air movement

Systemair Sileo RVK extract fans make the perfect choice for almost any hydroponic ventilation system. They have been market leaders in the ventilation industry since 1974, so you can be quietly confident that when you buy your RVK extract fan for your indoor grow tent, there’s been over 30 years of research and development behind it. This level of professionalism offers the modern-day grower the sort of build quality it is impossible to beat.

The Sileo RVK range from Systemair have been a staple in hydroponic shops throughout the UK since almost the very beginning of the industry. They are possibly one of the most tried and tested fan for indoor growers that you will find on the market. They may not be as super silent as some other types of extraction fan, but their performance is arguably second to none when it comes to efficiency of air flow rates and overall reliability.

With a price point that is hard to argue with, Systemair Sileo RVK extraction fans offer a high level of quality and performance, without charging the earth for it. If you are after a quick fix to high temperatures or poor air flow rates in your hydroponic grow tent, you would be wise to go and get yourselves one of these to fix the issue!


The Systemair RVK extract fan consists of the motor and impellors housed within a highly durable fibreglass re-enforced propylene casing. So, in the unfortunate event that you accidently drop the RVK when you are in the middle of hanging it up, it is highly likely to be completely fine! It is a small, compact and lightweight unit compared to most other types of extract fans, so installing it is usually a piece of cake.

The wiring box is sealed to IP44 rated standards, so it is entirely suited for use in wet room conditions, such as humid hydroponic grow rooms. Many brands of fan (and other products) do not even take this in to consideration when releasing a product onto the market. Water and electrical equipment generally don’t mix well. Any equipment that is subject to wet and hot grow room conditions will suffer if it has not been purpose-built for the task at hand, likely to underperform or break after a short period of time. Choosing purpose built equipment like Systemair RVK extract fans removes this risk altogether.

The impellor is backwards curved, and is carefully balanced in two levels to provide maximum air flow rates while reducing associated vibrations and noise. The design of the curvature of the blades has been carefully developed over many years of intense research and development. Combining the precision curved blades with the powerful motor, Systemair RVK fans will perform much better under pressure (of say attaching a carbon filter) than almost any rival.

Systemair Sileo RVK fans come complete with a handy mounting bracket, so installing exactly where you need them is a breeze. The fan is then simply connected to your ducting (making sure you have it pointed in the right direction!) and then switched on. Bingo! Your hot, humid and stale grow room air is now a thing of the past, leaving your plants to bask in the newly created perfect grow tent environment.


Firstly, you will need to wire the extraction fan up correctly to a power cable and plug using the appropriate cable. Simply follow the instructions embossed under the panel of the IP44 rated water tight junction box and wire it up accordingly. Please feel free to ask us in store to double check you are wiring it up correctly.

Once it’s all wired up, you simply connect the RVK extraction fan to the ducting in your hydroponic grow room, making sure you have it pointed in the right direction (see the embossed arrows on the unit) and you are good to go! Systemair RVK extract fans (in fact, the majority of extract fans) work best in an extraction system when they are connected to a suitable fan speed controller. Ensuring that your temperatures remain consistently stable is something all growers should aspire to achieving.

Each different sized model moves a different amount of air and are suitable for different sized areas respectively:

Systemair Sileo RVK 100E2 (4inch) – 184m3/h

Systemair Sileo RVK 125E2 (5inch) – 220m3/h

Systemair Sileo RVK 150E2 (6inch) – 428m3/h

Systemair Sileo RVK 150E2-L (6inch) – 720m3/h

Systemair Sileo RVK 200E2 (8inch) – 769m3/h

Systemair Sileo RVK 200E2-L (8inch) – 1008m3/h

Systemair Sileo RVK 250E2 (10inch) – 860m3/h

Systemair Sileo RVK 250E2-L (10inch) – 1080m3/h

Systemair Sileo RVK 315 E2 (12.5inch) – 1375 m3/h


Grow room ventilation systems are usually bought with the principle idea in mind being to control the temperatures in a hydroponic grow room or grow tent. While controlling temperatures is of course quite crucial, from the perspective of the plant the constant refreshing of the CO2 level is arguably more significant.

The air from a hydroponic grow room, or tent, will (usually) be extracted from the highest and most central point of the room. As this hot and humid air is being extracted from the top, fresh air enters the room from lower down, through either an active intake fan or passive ventilation holes. The constant cycle of hot air out and cool fresh air in, maintains the temperature, humidity and CO2 level at an optimal level for your plants.

A plants growth rate and growth pattern responds to changes in all sorts of parameters, but the main ones related to a ventilation system are, temperature, temp diff (between day and night), humidity and CO2 levels. Being able to control these parameters means you can have better control over your plant’s growth. So, choosing the right extraction fan is the first part of a much larger process!


It is not quite as easy as looking at the m3/h on the fans and choosing the model based on that. Especially if you are connecting your box fan to a carbon filter, you need to consider the increase in pressure this will have on the fan. When attaching a filter (or to a lesser degree, duct runs with bends in) you reduce the airflow that the fan can provide as it is essentially creating a resistance to that airflow. Making sure you choose the correct size of carbon filter for the relevant fan is crucial to ensuring you have a fully functioning extraction system.

Every room needs to be considered on an individual basis, there is no one size fits all option. However, you can give broad estimation based on either the sheer volume of your room, assuming one 600w per metre square area, then try to factor in other localised parameters like if it is on a south facing aspect of a property.

Based on Room Volume 

  1. In metres calculate the volume of your room. Multiply the length by the width, then by the height to give you the volume in metres cubed. (E.G:  In a 2.4m square grow tent. 2.4x2.4x2 = 11.52m3)
  2. Multiply this by 60, to get the overall volume you would move if you refreshed the air once every minute. (E.G: 11.52 x 60 = 691.2m3)
  3. Consider the impact of your carbon filter and ducting run. A typical minimum reduction in air flow rates you would see is 25%. So, multiply the previous value by 1.33 (E.G: 691.2 x 1.33 = 921.6m3)
  4. Use this figure as a rough guide to the size fan you will need. In this case, in a 2.4m square grow tent, moving 921.6m3 of air per hour would suggest either the RVK 200E2-L1, or the RVK 250E2-L1 would be suitable.

It is never quite as simple as this, but this is a good basis to go on. Ideally you need to take all other factors into account when choosing the correct size grow room fan. Please feel free to give us a call or pop down into the store and we can go through your circumstances to ensure you get exactly the right model for the job at hand.


All motors will reduce their output if more resistance is applied. Extraction fans are no stranger to this rule. Systemair have spent countless years perfecting their fans, making sure that they don’t crumble under pressure and drastically drop off in air flow rates.

But what exactly do we mean with pressure? Well if you pucker up your lips and blow out of your mouth, you will get a free flow of air coming out. If you try the same thing again, but someone puts their hand over your mouth, it makes it harder to blow and less air comes out. The same thing happens to an extract fan when you attach a carbon filter to it. It makes it much harder for the fan to work and you get a much lower air flow (you also will notice the power consumption go up as well).


The more pressure you create by restricting the fans free flow of air with things like carbon filters, the more you will notice a drop in the resultant air flow. Filters come in all different shapes and sizes and will all exert different amounts of pressure as a result. The manufacturer of the filter should be able to give you details of what pressure each model of filter will exert under differing airflows.

You can use the data supplied by the manufacturers of the filter and cross reference it to data supplied by the fan manufacturer. A graph commonly called a ‘pressure drop curve’ will tell you what each model of fan will do under varying pressures. Once you tie the two sets of data together, you can get a very accurate estimation of exactly what equipment will be most suitable for your indoor hydroponic grow room.

Once again, if you need any assistance with this, feel free to give us a ring, we will be happy to help. As usual when choosing equipment there is no one size fits all option, so make sure you get the most suitable product for your money. We are here for you!


Always try to use in conjunction with a high-quality fan speed controller. Not only will this help to accurately control your temperature, but also lower the noise from the fan when it is running on a lower speed.

Always make sure you follow the wiring instructions exactly as specified. Incorrectly wired fans will not perform as they would be expected to and worse, could break.

Always consider oversizing your fan (and filter) for your grow room. This will then give you the failsafe option of being able to step up your extraction come the super-hot summer months, when everyone else is struggling.

If noise is a concern, consider combining the Systemair RVK fan with products such as the insulated acoustic ducting, and grow room silencers. When used in combination with these products, the result can be surprisingly quiet, even though it is not a typical ’silenced fan’.

Always ensure you have an air tight seal between any connection in your ventilation system. Making use of fast clamps provides the most suitable option to ensure no unwanted smells escape. Don’t settle for masking tape when you have just spent hundreds of pounds on premium equipment!

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Systemair RVK Sileo Fans

Systemair RVK Sileo Fans