There are many top picks for the best carbon filter on the market. Good carbon filters must be able to cycle air efficiently and above all else remove all strong odors that form inside of a grow tent. Grow tent odor peaks during the flowering stage of budding plants.
This peak in odor can alert neighbors to your growing operation and can potentially flood your entire grow space, home or warehouse quickly.
Here, we will review the best carbon filters for a grow tent or room that provide the best in removing offending odors.
Below is our shortlist if you are an expert on carbon filters.
If you are new to the idea of adding a professional-grade carbon filter to your grow tent, be sure to read the entire article for tricks and tips on placement and what size carbon filter you might need to complete your grow room kit.
Best Carbon Filters in 2020 – Short List
- TerraBloom Air Carbon Filter, 6″ x 24″
- iPower GLFILT6M 6 Inch Air Carbon Filter Indoor Plants
- VIVOSUN 4 Inch Air Carbon Filter
- G-HYDRO 6 Inch Carbon Filter
- HG Power Air Purifier Carbon Filter
- Phresh Filter 701005 Filter
Carbon Filter Reviews
Odor in the grow room or grow tent means it’s time for a carbon filter.
Carbon filter odor control using high quality active carbon is the obvious solution.
But, which is the best carbon filter for a grow room? Below are our reviews of carbon air filters to help you make the right decision for your grow room setup.
Do Carbon Filters Really Work In Grow Tents or Grow Rooms?
The simple answer is YES! When setting up properly with an inline fan, they do more than just remove 99% of the odor.
They also circulate fresh air and help to keep your temperatures in the proper range for healthy indoor plants to grow.
Our list of the best carbon filters for grow rooms and tents is below.
TerraBloom Air Carbon Filter Review
TerraBloom makes some of the best carbon filters on the market when it comes to eliminating odor and circulating fresh air. Our favorite carbon filter model made by TerraBloom is the 6″ x 24″ model that incorporates RC-48 charcoal sourced from western Australia. The carbon bed is 46 millimeters thick and packed tightly using small granules which allow for more surface area exposure.
A typical carbon filter has about 15% less carbon and thus will not last as long as the TerraBloom model.
This particular carbon filter, although slightly more expensive than others on this list of carbon filter reviews, will technically last 15% to 25% longer because of its high quality carbon construction.
Although it incorporates more carbon inside of its galvanized steel frame, the airflow with this filtration system is still extremely efficient when operating in tandem with a good inline fan. The TerraBloom filter also comes with machine washable pre filters as a bonus.
It is rated up to 550 CFM and is effective for at least 24 months under ideal conditions.
- 2 machine washable pre-filters
- 90-day warranty
- 6×24 inches
- 550 CFM
iPower GLFILT6M Carbon Filter Review
If you have to ask the question, “Do carbon filters really work in tents?” then you should check out this “best of” carbon filter and your question will be answered.
The iPower GLFILT6M Carbon Filter incorporates quality Australian charcoal and has the best air flow compared to other products that are similar to this air filter.
This filter works best around 200 CFM to 400 CFM and is built to last around 2 years with perfect filtration conditions.
The outer mesh holds the 50mm carbon layer together while it cleans the air very well.
iPower, known for quality indoor growing products created this carbon filter to really soak up the odor and it does it perfectly. You won’t have to worry about your neighbors smelling anything and paired with a quiet inline fan, no one will be the wiser.
- 6″ flange
- 16″ long
- Extended life at 24 months
- 1 pre-filter included
VIVOSUN 4 Inch Air Carbon Filter Review
For smaller grow rooms or grow tents the VIVOSUN 4 inch carbon filter should fit the bill for proper odor control and effective airflow.
Constructed with virgin Australian activated charcoal the company boasts that it has 100% airflow when it comes to recycling fresh air back into your grow tent.
The 1050+ RC-48 charcoal is designed into this filter to allow for maximum surface are to help eliminate bad smells from your indoor growing.
Like all the filters on this list, the VIVOSUN 4″ filter allows for both exhaust and intake depending on your grow room setup or complete grow room kits.
The charcoal bed is 2 to 2.5 inches thick which is plenty to maximize effectiveness in a smaller tent. Rated at 200 CFM and comes with a pre-filter to help with the odor removal.
- 1 pre-filter included (can be purchased separately
- Comes with filter belts for easy installs
- 4″ x 14″ long
- 100% airflow
G-HYDRO 6 Inch Carbon Filter Review
When we took a look at the G-Hydro 6 inch carbon filter review we were impressed at its air flow ability that put this carbon filter on our list. It also looks really cool and less industrial in feel as some of the others on the list.
This year, G-HYDRO added an upgraded hexagonal hole which opens up its air flow versus a standard round type whole, effectively increasing the ventilation from 52% to 62%.
This carbon filter for your grow tent or grow room uses premium activated charcoal in order to soak up bad odors and completely removes them from you space.
1200+ RC48 Virgin Australian charcoal is what makes this a high quality carbon filter and from a price perspective, best in its class.
Another nice benefit of this charcoal carbon filter is that it has an extended life expectancy. This is due to its reversible flange and design.
- 515 CFM
- 6 x 20 inches
- Ventilation rate at 63%
HG Power Air Purifier Carbon Filter Review
Our HG Power Air Purifier Carbon Filter was perfect when it came to eliminating dank odors from the grow tent. Using a 38mm layer of Australian activated charcoal is how it effectively works well.
This filter also has a reversible flange that gives you some options when setting up a carbon filter inside a grow tent.
These filters also look great and come with a 12-month guarantee and the company also has good customer service should you need some answers to common issues using this carbon mesh filter.
Phresh Filter 701005 Filter Review
Phresh Filters manufacturers high quality air purifying filters that have maximum air flow and odor removal qualities unmatched by bargain brands.
Our favorite Phresh carbon filter hands down is the Phresh 701005. Not a fancy name but where its name leaves you wondering, its operation wont.
It did a fantastic job of removing all smell from our 4×4 grow tent in a matter of about 2 minutes. Very good air circulation with this filter. Be sure to pick out a quality inline fan with this one so you can see its benefits.
This filter is a bit more expensive than the others on the list but for good reason…
It lasts up to 24 months and does a superb job with bad odor elimination. Using a 46mm bed of virgin activated charcoal it eliminates 99% of offensive smells from grow rooms.
The packaging is very discreet so prying eyes won’t know what you are up to and the carbon filter itself incorporates a unique anti-air bypass system which from my understanding makes the process of air circulation happen much quicker.
Our tent seemed to cycle the complete air inside the tent in about 1 minute which is pretty fast. Of course we did have an upgraded inline fan that also helped.
Carbon Filter FAQ’s
How Good Are Carbon Filters? – A quality carbon filter is very good at removing offending odors. Carbon molecules bind to odor type molecules and neutralize “smell” with very effective results.
How Big Of A Carbon Filter Do I Need? – Figuring out the proper can filter size for your room can be done by calculating the cubic feet of the room or tent and dividing that number by the time in minutes you would need the air to circulate completely.
2 minutes is the gold standard for complete air circulation in a tent or grow room. In order to find the proper can filter for your room, you simply calculate the cubic feet of the room and divide that by the number of minutes you would like to exchange your air (2 minutes is good).
That will be the minimum CFM of your fan. The CFM number should be higher than the exhaust minimum of the filter itself.
How Long Do Carbon Filters Last In A Grow Room? – The expiration for carbon filters is generally around 4 years. Other factors affect a carbon filter’s longevity such as humidity, usage, plant types, and quality. That being said, in a grow room environment, expect them to last 12-24 months.
Final Notes On Carbon Filters
Although not necessary to grow big buds indoors, a carbon filter inside a grow tent is always a good thing to have. Not just for the smell but also for your plant’s health. Air circulation inside a tent is a must for healthy buds hands down.
A carbon filter is a perfect add on to venting systems because they do what they are supposed to do.
Eliminate the strong smell of cannabis during the budding stage. I typically will add the carbon filter as I make the switch from veg to flowering as this is when smells with a certain strength begin to form.