How To Use Carbon Filters In Your Medicinal Plants Grow Room

January 22, 2022

Growing medicinal plants indoor comes with a large set of advantages. You’ll have complete control over temperature, humidity, water, and lighting. Such command over your growing space will enable you to boost plant health, optimise yields, and keep pathogens and pests at bay. 

However, growing indoors comes with a downside, too. Things can get very, very smelly. You might get used to the pleasant and floral odour, only to be reminded of the intensity of the terpenes when having guests over for dinner. While exposing friends and family to the signature scent of medicinal plants might not be an issue, landlords and nosey neighbours are an entirely different story.

You can keep your indoor growing operation completely private by removing skunk-y smells from the equation. After looking for a solution to this issue for decades, cultivators finally stumbled across a piece of kit that works remarkably well: carbon filters. Find out how these stealthy devices can eradicate obvious aromas and keep your medicinal plants grow clandestine.

What are Carbon Filters?

Carbon filters play an important role in any indoor cultivation environment. Aside from growing tents, these devices are also found in air conditioning and furnaces where they help to capture contaminants while allowing clean air to pass through.

These filters feature layers of activated carbon, a form of carbon treated to features small, low volume pores. These small holes vastly increase the surface area of the filter, which provides much more space for chemical reactions and filtration to take place.

How Carbon Filters Work

Carbon filters use the principle of adsorption—the adhesion of molecules to a surface—to scrub the terpene-rich air found in grow tents. Because activated carbon possesses a greatly enhanced surface, it serves as the perfect substance for the job. To put things into perspective,  a single gram of active carbon features a surface area of 3,000m²!

To ensure terpenes pass through the filter, growers need to create a vacuum in the grow space. Exhaust fans that match the requirements of the carbon filter in use will drag air through the device and out of the grow tent. Adequate suction will force all of the terpene-rich air through the filter, preventing any from leaking out of the sides of the grow tent.

As the smelly air passes through the filter at the correct speed, the active carbon will capture airborne terpenes while allowing other molecules to pass through, preventing the obvious smell of plants from seeping out of the grow tent. By attaching ducting to the external outlet of the exhaust fan, growers can direct odourless air out of the nearest window or ventilation shaft.

Where to Put a Carbon Filter in a Grow Room

Carbon filters typically suspend just below the ceiling of a grow tent. Use the following step to position them perfectly:

  • Connect your filter to an exhaust fan that features a compatible CFM (cubic feet per minute) and duct diameter.
  • Secure the two devices firmly together using an airstrip or duct tape.
  • Hang the setup from the roof bars of the grow tent, as high up as possible.
  • Connect ducting to the outlet of the exhaust fan and secure with duct tape.
  • Feed the opposite end of the ducting through the designated hole on the side of your grow tent.
  • Position the ducting outlet near an open window or ventilation shaft.

Here I'd like to share with you three efficient carbon filters.


  • Specific Surface Area: 900-1000 square meter per gram
  • Max. Endurable Temperature: 400 degrees Celsius (Safer)
  • Operating Environment Temperature: -20 to 65 degrees Celsius
  • Zinc-anodized steel housing mesh
  • Use Coal Based activated carbon
  • Changeable Velcro Pre-filter with 2 black elastic bands
  • Thick Carbon Layer for Higher Absorption and Performance
  • Reversible filter flange and base for longer life
  • Exceptional odor control for better privacy.
  • Inner and outer mesh provides 53% open area allowing increased air flow.



  • Overall Size:
  • 4" Flange: 10"H x 8"D
  • Flange(optional): 4",
  • Iodine Adsorption Value: 950 (High efficiency)
  • Carbon Layer Thickness: 1.5 inches
  • Specific Surface Area: 900-1000 square meter per gram
  • Max. Endurable Temperature: 400 degrees Celsius (Safer)
  • Operating Environment Temperature: -20 to 65 degrees Celsius
  • zinc-anodized steel housing mesh
  • use Coal Based activated carbon



  • Superior carbon quality: Made of high quality activated charcoal, delivering 100% filtered airflow.
  • Eliminates odor and chemical irritants: Protects from chemical irritants and eliminates odors- from pungent indoor grow operations to bathrooms, basements and kitchens. Absorbs odors from pets and smoking as well.
  • Effective odor control: Eliminate some of the most undesirable odors, pungent smell and particulates from indoor grow tent, hydroponics grow room.
  • Versatile applications: Item can be used as intake or exhaust filter in a variety of setups including use with 6 inch inline fan and duct fans, intake and exhaust fans, air exchange fans, ventilation ducts, and other accessories.

If you are also interested in other grow equipments, welcome to visit our website:

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