Which charcoal filter to choose for indoor cultivation?

Which charcoal filter to choose for your indoor cultivation?

When growing plants indoors, air quality is an important factor to consider. Indoor grow rooms need an effective filtration system to remove odors, unwanted particles and contaminants from the air. Of all the options, charcoal filters are widely recognized for their ability to purify the air effectively and discreetly. However, choosing the right charcoal filter for your grow room can be a daunting challenge. In this article, we'll help you choose the optimum charcoal filter for your indoor grow room.

Choose your charcoal filter according to the size of your grow box.

 The first thing to consider when choosing a carbon filter is the size of your grow room. Charcoal filters come in different sizes and capacities, so it's important for any grower to choose a model that matches the dimensions of your growing space. A small filter may not be powerful enough to effectively remove odors, while one that's too large may take up too much space and be excessive for your needs.

Important: choosing your extractor

First, check the flow rate of the air extractor, as your filter purchase depends on it. Then, select a filter based on its performance rather than its design, price or size. Its filtration capacity, expressed in cubic meters per hour (m³/h), should be greater than or equal to that of the extractor, otherwise your extractor may have a shorter service life.

The airflow of your ventilation system

The airflow rate of your ventilation system is another important factor to consider. Carbon filters are rated according to the volume of air they can handle, measured in cubic feet per minute (CFM). It's important to choose a carbon filter with sufficient airflow to fit your ventilation system. Insufficient air flow can lead to inefficient filtration and air circulation problems in your grow room.

For harmless odors, contact between air and activated carbon for a period of 0.05 to 0.2 s will suffice to obtain satisfactory results. If you require satisfactory air filtration at flow rates of 100 to 200 m³/h, a quality 1 kg activated carbon (coconut shell carbon or 4 mm carbon granules) with an iodine absorption capacity of 1150 mg/g and a density of approximately 450 g/l will be perfect for your indoor cultivation.

Lifetime of a carbon filter

Service life depends on the environment in which the carbon filter is located. A very smoky environment will expose your filter to extreme loads and shorten its service life.

When you're near a main road, fine dust can affect the quality of your charcoal filter. Generally speaking, when the ambient air is purer and air flow rates are lower, service life will be longer. In other words, if you want to extend the life of your charcoal filter, use it only when necessary (bad air odor). Reduce the air flow and you'll extend its life.

Installation of its filter in a growing space

It's best to place the large, heavy activated carbon filters vertically in your grow box, and the small filters under the ceiling. The filter must draw in warm air and evacuate it to a cooler environment. If you don't follow these instructions, the charcoal will condense, become damp and fail to filter the ambient air.

The brand and quality

When choosing your carbon filter, as with any purchase, it's important to consider both brand and quality. In order to choose a high-quality filter, prefer well-known, reputable brands to ensure a reliable, efficient filter. It's true that we tend to go for less expensive options, but these filters will often be less durable and, above all, less effective in the long term.

Frequently asked questions

Where should I place my carbon filter?
The charcoal filter should be located inside the growth chamber. It's best to place it high up, as the warm air rises and the filter will be able to filter odors optimally. Try to choose a location close to the extractor to minimize the length of the duct.
Do I have to clean my carbon filter?
Be sure to attach flexible or rigid conduit to the charcoal filter. Use hose clamps or adhesive tape to ensure a watertight connection. Then connect the other end of the duct to the air extractor inlet. Again, use hose clamps or adhesive tape to ensure a watertight connection.
How do I attach it to my extractor?
Yes, it's best to maintain your filter regularly and replace it according to the manufacturer's recommendations, to achieve effective, healthy odor filtration and keep your environment clean for growing your indoor or outdoor plants.
What equipment do I need to install my carbon filter?
First of all, of course, choose the charcoal filter of your choice. Then choose the right extractor for your filter. A flexible or rigid sheath adapted to the diameter of your filter and extractor. Hose clamps and adhesive tape to secure your hose. Suspension brackets (chains, hooks or adjustable straps). Tools, such as a screwdriver, pliers and other assembly tools.

Indoor light offers you three brands of renowned carbon filters

Carbon filters from Prima klima

Prima Klima charcoal filters have an excellent reputation in the world of indoor horticulture and ventilation. They offer top-quality charcoal filters, thanks to their robust, hard-wearing materials. Activated carbon is used for the filters, capable of neutralizing odors and contaminants. Prima Klima stands for advanced technology, durability and energy savings.

Introducing the prima lima K2600 Mini carbon filter

What are the advantages of this carbon filter?
  1. Air filtration efficiency is enhanced by a 3 cm thick bed containing CTC75 highly activated carbon with a surface area of over 1200 m2/g, the same quality used in the Industry Lin range.
  2. Capable of capturing a wide range of particles and unpleasant odors, making it ideal for optimal air purification.
  3. The press's high-end metal components guarantee high-quality stability and longevity.
  4. It includes a dust pre-filter.
  5. The K 2600 Mini carbon filter can be easily fitted to most air extractors.
  6. The extra-long flange guarantees a secure connection.

In short, choosing the right charcoal filter is very important for air filtration in your grow room or other space, whether professional or personal. Prima Klima's K2600 Mini charcoal filter is the solution of choice, built with solid, high-quality materials, it will be with you for a long time to come to maintain a clean, healthy environment.

The K 2600 Mini carbon filter is compatible with the PK 125L extractor

Prima Klima has developed a single-speed extractor that can supply or extract air in a variety of environments, such as indoor cultivation areas and professional premises, provided a round ventilation duct is available.

What are the advantages of this extractor?
  1. Designed with an ebm-papst AC motor and backward-curved blades, this extractor is remarkably efficient. According to the manufacturer, they generate 15% more airflow than a competing axial fan.
  2. The polyamide (nylon) casing is highly shock-resistant.
  3. Long-life, maintenance-free ball bearings ensure flexible, particularly quiet motor operation.
  4. High airflow for optimum ventilation, reducing humidity levels and eliminating unwanted odors.
  5. The PK 125L extractor can be easily installed on a ceiling or wall, thanks to its streamlined casing containing the control box, electrical connections and 52 W motor.

Carbon filters from Secret jardin

Secret Jardin's DF16 charcoal filters are high-quality equipment specifically designed to effectively eliminate unwanted odors in indoor grow rooms. With a filtration capacity of 150m3/h, this filter can only be connected to Secret Jardin's DF16 - 3-speed extractor.

DF16 150m3/h carbon filter presentation

What are the advantages of this carbon filter?
  1. This filter is highly absorbent thanks to its high-grade CTC80 activated carbon. It contains one kilo of activated carbon in three three-centimeter-thick layers. This guarantees purer air in your grow room.
  2. Secret Jardin uses top-quality materials and solid construction to guarantee a long service life and reliable performance.
  3. This filter is very easy to install in a very short time, and no tools are required. It is mounted on the DuctingFlange system.
  4. The CTC80 filter features state-of-the-art filtration technology for optimum absorption of odors and airborne pollutants. Thanks to its optimized design, it provides effective filtration while ensuring optimum air circulation through the filter.  In conclusion  

Opt for a DF16 - 150m3/h carbon filter from Secret Jardin, it combines build quality, efficient filtration performance, durability and ease of use, making it an ideal choice for controlling odors and maintaining a clean, healthy indoor growing environment.

The DF16 - 150m3/h carbon filter is compatible with the DF16 - 3-speed 150m3/h extractor.

This powerful extractor offers three adjustable fan speeds (150/250/350 m³/h), allowing you to tailor the airflow to the specific needs of your plants at different stages of their growth. This extractor includes a built-in thermal sensor as well as a remote sensor. Perfect for small to medium-sized growing areas.

What are the advantages of this extractor?
  1. This extractor is an essential piece of equipment for improving air quality in your growing space. It eliminates all contaminants, odors and heat, to promote the health and growth of your indoor plants.
  2. Secret jardin uses top-of-the-range materials, and its polyamide casing ensures longevity of use for all growers, whether beginners or professionals.
  3. Its compact, lightweight design makes this extractor easy to integrate into your grow room. It can be installed on the Ducting Flange system, either for extraction or intraction.
  4. DF 16 range extractors feature low noise emission, depending on extraction speed, ranging from 36dB to 61dB. This means you can grow without disturbing your surroundings.
  5. With its three fan speeds, this extractor can adjust the airflow to suit your needs.  The versatility of this extractor makes it an undeniable choice, as you can use it as an internal or external extractor, and as an internal or external instructor, depending on the specific needs of your crops.
  6. An air extractor is a must-have for any growing area, to help maintain the health of your plants. It helps to maintain optimum air quality by evacuating warm humid air and possibly pathogens or mold spores, replacing it with pure, clean air. 

Carbon filters from Garden Highpro

Proactiv charcoal filters from Garden HighPro are indispensable for eliminating unwanted odors in indoor growing areas. Their multi-layer filter mats and fine particles of virgin coconut activated carbon make them lightweight and extremely efficient. 

Introducing the Proactiv 125mm - 250m3/h carbon filter

What are the advantages of this carbon filter?
  1. A filter made from food-grade, virgin coconut shells for maximum absorption of odors and airborne contaminants.
  2. Easy installation thanks to suspension rings that facilitate integration into the grow room ventilation system.
  3. The filter is made from several layers of wool hermetically bonded at both ends, preventing air from entering. This maintains optimal growing conditions for plants while eliminating unwanted odors.
  4. Its high carbon density of 730 gr/m2 is essential for high performance efficiency.
  5. Garden HighPro's carbon filter is made from robust, hard-wearing materials. It adapts to the most demanding growing environments.

The Proactiv 125mm - 250m3/h carbon filter is compatible with the 125mm - 190m3/h 1-speed extractor.

The Profan 20W air extractor from GardenHighPro features a 20W single-speed fan that can extract or supply air at a rate of 190m³/h to your grow rooms. Designed for continuous operation, it is compatible with 125mm diameter carbon ducts and filters.

What are the advantages of this extractor?
  1. The PROFAN air extractor is an indispensable tool for improving air quality in your growing space.
  2. The Garden HighPro brand uses top-of-the-range materials for all growers, whether beginners or professionals.
  3. Its compact, lightweight design makes this extractor easy to integrate into your grow room.
  4. The extractors in the PROFAN range are low-noise, so you can grow without noise pollution.


Choosing the right charcoal filter for an indoor growing space is paramount for any professional or novice grower. An efficient filter is essential to eliminate unwanted odors while ensuring a clean and healthy growing environment for your plants, flowers and herbs. In this article, IndoorLight brings you the various options available on the market, highlighting the technical features, qualities and benefits of some of the most popular carbon filters, such as those from PrimaKlima, Secret Jardin and Garden HighPro.

The PrimaKlima brand is renowned for its high-quality charcoal filters, made from solid materials and premium activated carbon. Their filters offer filtration efficiency, construction durability and simple installation and maintenance, making them the perfect choice for demanding indoor growers.

Similarly, Secret Jardin's charcoal filters, such as the CTC80, are also highly prized for their quality of construction, advanced filtration and universal compatibility. Thanks to these filters, odors are effectively absorbed while promoting optimal air circulation.

Finally, Garden HighPro charcoal filters are another popular alternative, offering a combination of build quality, efficient filtration performance and versatility. Thanks to their advanced filtration technology and solid construction, their filters are a reliable option for indoor growers of all experience levels.  In summary, the selection of a charcoal filter for your indoor grow room or other use will be influenced by a number of factors, such as the size of your growing space, the airflow required and your budget. It's vital to select a filter that's tailored to your particular needs, while guaranteeing reliable, long-lasting performance.

With PrimaKlima, Secret Jardin, Garden HighPro or other renowned brands, it's important to carry out thorough research and consider all the technical features and qualities in order to make the best possible decision. In the end, a top-of-the-range carbon filter is a valuable investment that will play an essential role in the success of your home cultivation.

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