Best Carbon Filter for Grow Room or Grow Tent

When your flowering cannabis plants start producing that sweet stinky smell, your going to need the best carbon filter to hide it.

There are other ways to hide the smell like gels and air purifiers.

These are meant for outside the room or tent, and they just mask the scent.

Check out our odor control post for more info.

We go over the top-rated premium filters, and also let you know on the best carbon filter for the money, that’s in a reasonable price range.

So it’s great if you’re on a budget.

Carbon scrubbers can be expensive, and some are lower priced.

The difference is they just do not last as long.

Lifetime should be one factor in making a decision.

If you don’t want to buy one every six months to a year or replace one up to three years depending on use.

Top 5 Carbon Filters by size:

4 inch :iPower 4 inch
6 inch :Phresh 6 inch
8 inch :Phat 8 inch filter
10 inch :iPower 10 inch
12 inch :iPower 12 inch

So let’s take a look at,


What is a Carbon Filter and How Does it Work?


A carbon filter is made up of a tube encased with metal and lined with activated charcoal or also known as carbon, and other fabric.

How the carbon filter works is it absorbs the air being pushed either through it or the air can also be drawn out of it.

This is done by using an inline fan. It’s probably the best way to get rid of odor.


What to look for in a carbon filter


There are some things to consider when looking for a carbon filter here are the most important to consider.

The area covered, how much space is required and does the carbon filter clean the air.

Quality of carbon inside the filters, where is the carbon sourced. Not all carbon has the same absorbent rate. 

On other factor is how the charcoal is extracted.

How long they last, some carbon filters are cheaply made an only last a couple of months.

Other can last up to two years if used as recommended, by washing the pre-filter or changing it regularly.

Replaceable fabric sleeve or pre-filters are great for extending the life of your filter.

Some are machine washable which is a nice feature instead of purchasing one every six months or so.

Other sleeves can be purchased at a reasonable cost.

Dual function, the ability to be used on inline or exhaust fan.

With dual role, it’s a great feature so you can to be versatile in where you can place the filter.

You will also extend the length of your filter.


Now let figure out what size of filter you’re going to need.


Carbon filter size calculator

When using a carbon filter for your grow room or grow tent it’s recommended to get a filter that will match the area of the intended grow.

You will also want to clean the air a certain amount of times per hours for proper removal off odor, and overall plants health.

Some grower go for 30 times an hour other go for 60 times an hours ( recommended)

A simple calculation is used to determine the size.

The formula is:Length X Width = Area , Area X Height = Total Volume ( cubic feet)

On a side note: You can play with the numbers a little if you do not want to clear the air 60 times an hour. 

Maybe just 40 times just take the total cubic feet x 40 / 60 = Total CFM.

How big of filter for a 4×4 grow tent?

For a 4×4 grow tent with a height of 6.5 feet the size of carbon filter would  be : 4 x 4 = 16 , 16 X 6.5 + 104 cubic feet + 104 CFM

A 4 inch filter should be enough to clean the air of odor from the 4×4 grow tent.


Best carbon filter for grow room or grow tent

Here are the top carbon filters ranging from premium brands to a more on a budget with quality.


Best 4 inch carbon filter

Vivosun 4 inch Carbon Filter


  • 310 CFM
  • Long-lasting
  • Hand wash sleeve
  • 4″ x 14″

The 4 inch Vivosun carbon filter is a long lasting at a great price.

Made with Virgin Australian activated charcoal the Vivosun 4 inch filter will clean the air form your grow room or grow tent with ease.

The filter can be used two different ways for optimal performance and extending the length of the filter.

This carbon filter by Vivosun is great on a budget and will remove the stinkiest strains quickly and efficiently.

Providing it with a great way to clean the air in your grow room or tent.  

This filter can clean 310 cubic feet per minute.

The filter sleeve is hand or machine washable this extends the length of the filter. The carbon filter can last up to three years of constant use.

Phat carbon filter 4 inch


  • 12 X 4 Inches
  • 200 CFM
  • Long-lasting
  • No chemicals

The Phat filter is made from oldest charcoal on the planet.

It’s from the Precambrian era. Carbon in the filter is chunky and is not glued or made of pellets.

The charcoal is mined using steam, so no harsh chemical is contained in the carbon.

Phat 4-inch filter can clean the air of stinky odor of cannabis at a rate of 200 CFM.

iPower 4 Inch Air Carbon Filter


  • 12 X 4 Inches
  • 200 CFM
  • Long-lasting
  • Great airflow

The Ipower 4 inch carbon filter is an excellent filter on when needing to save money.

Ipower 4 inch filters are made with super absorbent carbon form Australia. A long lasting filter said to be able to go up to 1.5 years.

Recommend to replace the fabric sleeve every six months to prolong the life of the filter.

Another feature to the fabric sleeve is that it has a 53 percent open rate which is great for airflow.

The thickness of carbon in this filter is 50mm this is comparable to premium brands.

If you’re looking to save some cash, this may be an excellent option to consider.

The Ipower 4 inch filters work well in grow tents.


Best 6 inch carbon filter

Phresh Carbon filter 6 inch


  • 6×12 inches
  • 450 CFM per hour
  • Long-lasting
  • Great air flow

The 6-inch Phresh carbon filter is twice as light as other brands.

Its able to control the odor and other contaminants like dust and pollen just as good as other premium brands.

The Phresh filter has RC-48 Australian activated carbon.

This carbon is untouched called “virgin charcoal” which has no chemical or nasty stuff used to extract charcoal carbon from the ground.

The filter also comes with a custom mesh shield with 51 percent open air flow.

Inside the base is shaped like a cone for optimal airflow, instead of regular tube-based models.

The filter is expected to last up to 2 years.

VIVOSUN 6 Inch Air Carbon Filter


  • 6 x 16 inches
  • 350 CFM per hour
  • Long-lasting
  • replaceable sleeve

The Vivosun 6 inch carbon filter It’s great when on a budget.

This filter can do a pretty decent job removing odor from your grow tent or small grow room.

Made with activated virgin charcoal that comes in the from Australia and is in small chunks rather than pellets.

The filter also comes with a Fabrics leave which can be replaced every six months.

Vivosun filter does not last as long as premium filters, but it can do the job for a while. Some growers have used the filter for over a year.


Best 8-inch carbon filter

​Terrabloom carbon filter 8 inch


  • 8 x 24 inches
  • 750 CFM per hour
  • Long-lasting
  • 2 replaceable sleeves

The Terrabloom carbon filter uses carbon from Australia which is some of the best in the world.

Instead of using pellets and chucks like other brands, the terra bloom has small granulated carbon.

This prevents air pockets in the carbon when packaged.

The size of carbon inside is a thickness of 46 mm. The filter is said to be able to last up to two years.

Terrabloom includes two machine washable fabric sleeves in black and white.

VIVOSUN 8 Inch Air Carbon Filter


  • 8 x 20 inches
  • 450 CFM per hour
  • Long-lasting

The Viviosun 8 inch carbon filter has maximum air flow never 53%.

With both the inside and outside mesh filters are essential for cleaning the air efficiently.

The activated carbon inside is just as good quality as the premium brand which comes from Australia.

Vivosun say their filters can last up to 2 years if used as recommended by the manufacturer.

The Vivosun could be something to check out when low on funds or looking to save some cash.


10 inch carbon filter


Phresh 10 inch Carbon filter


  • 10 x 24 inches
  • 850 CFM per hour
  • Long-lasting
  • Flange included

The Phresh Filter 10-inch model is great if you’re looking for a lighter carbon filter that can efficiently remove odor.

Most 10-inch can filter heavy and weigh a tonne. 

The carbon filter by Phresh has an internal base that is cone shaped which provided superior airflow at 850 CFM. T

he carbon inside is very high quality from Australia and is extracted from the earth with no harsh chemicals.

The virgin charcoal in the Phresh filter is some of the best in the world at removing odors.

There is also a custom fabric sleeve which has increased 51 percent airflow.

Great for a more extensive grow room or a larger grow tents.

iPower 10 Inch Air Carbon Filter


  • 10 x 39 inches
  • 1150 CFM per hour
  • Long-lasting
  • Pre-filter included

The iPower Carbon 10-inch filter can be used if you need something a little less expensive.

This carbon filter uses activated carbon RC412 from Australia Which is super absorbent.

The ipower filter weighs about 50% less than other filters. It also can last up to a year-and-a-half before it needs replacing depending on use.

It also comes with the pre-filter or Fabric sleeve to go over the top.

This will prolong the life, it’s recommended to change the pre-filter every six months.

The iPower sleeve has 53 percent airflow.


12-inch carbon filter


Mountain air carbon filter 12 Inch


  • 16.2 x 16.2 x 42.6 inches
  • 1200 CFM
  • Long-lasting
  • Reduces noise

The Mountain air 12-inch carbon filter is the biggest one in their line.

This carbon filter is for big grow room that needs to move air out fast and efficiently.

The filter can remove odor in an area of 1200 CFM made with noise reduction muffled design.

Long lasting up to three years of constant use, every six months it’s recommended to clean the fabric sleeve to prolong the use of the filter.

iPower 12 Inch Air Carbon Filter


  • 12 x 24 inches
  • 1150 CFM per hour
  • Long-lasting
  • Pre-filter included

The iPower 12 INch carbon filter can be used when on a budget.

A highly absorbent carbon from Australia in this filter.

With the lifespan of 1.5 years if properly maintained. A sleeve is included which is recommended to be replaced every six months.

 A slightly smaller carbon filter in length is still pretty powerful at removing odors and contaminants from your grow room or tent.

How to Take Care of your Carbon Filter


A good way to take care of your carbon filter is to make sure you have an additional fabric sleeve for it this will extend the length of the filter.

Also you can use the inline fan in different positions to either draw air in or push it out through the filer. This will prolong the life of it as well.

It is also best to get a size larger than what you require , this will also extend the life of the filter.


How to Set-up Carbon Filter in a Grow Room

Setting up a carbon filter is really simple you have many options in the grow room. 

Hang Filter

You can hang the carbon filter from the ceiling by using some hooks naad the straps provided with your filter.

Then take the air ducting and run it through a wall or exterior and hook up the inline fan outside of it.

Have filter outside of grow room 

Just place the filter on something to hold it up a milk crate preferably or you can also hang it .

Then run some air ducting into the grow room and have your fan inside the room to have it suck out the air to the filter outside the room.


Final Thoughts

When you’re looking for the best carbon filter for your grow room or tent there are so many out there.

All with different sizes and cost it can be hard to sort through all the noise

Remember the three key factors which are price performance in longevity.

If you’re on a budget, it’s okay to get a inexpensive carbon filter just remember it just won’t last as long, but it should be able to reduce the odor of your stinky plants.

Some of the more premium models will last longer they are a little more expensive, but if you can afford it, it’s probably the best bet.

The great thing is you don’t have to replace your carbon filter every three months to a year.

Carbon filters are essential when you need to get rid of the odor of your flowering marijuana plants.

Do you use carbon filters?

Which one do you use?

Let me know in the comments

Keep Growing 

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