Best Carbon Filter for Grow Room or Grow Tent – Ultimate Guide

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.

This guide is really long, if you want to skip ahead click on a link below to take you straight there!

So let’s take a look at,

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 4x4 grow tent?

For a 4x4 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 4x4 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

Mountain air carbon filter 4 Inch

Key Features:

- 7.3 x 7.3 x 18.6 inches

- 310 CFM

- Long-lasting 

- Hand wash sleeve

The 4 inch Mountain air carbon filter lasts forever.

Known for its long-term use which features the ability to move more air through the filter quickly.

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

The benefit of the Mountain air is that reduces the noise level of when used with an inline fan.

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

 Top Pick 

Key Features:

- 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

 Top Pick  

Key Features:

- 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 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.

Best 6 inch carbon filter

Mountain air carbon filter 6 Inch

Key Features:

- 10.5 x 10.5 x 42.6 inches

- 600 CFM per hour

- Long-lasting 

- Noise reducer

The Mountain air 6 inch carbon filter is a popular choice for growers looking for a long lasting filter.

Made with a muffled design which cuts the noise from your inline fan.

The 6-inch mountain air can clean a total of 600 cubic meters per hour.

Mountain carbon filter can eliminate odors quickly . Not only does the mountain air remove odor it also removes contaminants from the air.

Perfect for medical grows.

Phresh Carbon filter 6 inch

 Top Pick 

Key Features:

- 6 x 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 carbon" 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

 Top Pick 

Key Features:

- 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 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.

Grow tip: If you want to prolong the life of your carbon filter, it's best just to use it during the flowering stages, that way you might even get an extra four months out of a year's use.

Best 8-inch carbon filter

Phat carbon filter 8 inch

 Top Pick 

Key Features:

- 8x 39 inches

- 950 CFM per hour

- Long-lasting 

- optimal air flow 

Phat carbon filter 6 inch is bigger than your average 8-inch filter.

Inside Phat adds extra carbon the is 2 inches thick, more significant than most standard filters.

The carbon filter also comes with twice as many holes than other brands out there providing optimal air flow.

Carbon in the Phat filters is virgin charcoal and is collected using high-pressure steam.

What’s Different about the type of carbon in this filter is that is in a chunky form and not in a pellet form like most of the other filters out there on the market.

The phat filter is excellent at removing pollen dust and other contaminants, and of course, nice stinky odor from the grow room or grow tent.

​Terrabloom carbon filter 8 inch

Key Features:

- 8x 24 inches

- 750 CFM per hour

- Long-lasting 

- 2 washable 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

 Top Pick 

Key Features:

- 8x 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.

Best 10 inch carbon filter

Mountain air carbon filter 10 Inch

Key Features:

- 14.2 x 14.2 x 42.6 inches

- 960 CFM per hour

- Long-lasting 

The 10-inch carbon filter by Mountain air is made for bigger rooms.

It can clean a total of 960 cubic meters per hour.

Made for long-lasting performance, that can eliminate odors and contaminants in the grow room.

Mountain air filter comes with a washable fabric sleeve in either the washing machine or by hand (recommended).

 The filter can last up to three years.

Phresh 10 inch Carbon filter

 Top Pick 

Key Features:

- 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

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

The carbon 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 room.

iPower 10 Inch Air Carbon Filter

 Top Pick 

Key Features:

- 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.

Best 12-inch carbon filter

Mountain air carbon filter 12 Inch

Key Features:

- 16.2 x 16.2 x 42.6 inches

- 1200 CFM per hour

- 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.

Black Ops Carbon Filter 12 inch

 Top Pick 

Key Features:

- 12 X 48  inches

- 1700 CFM per hour

- Long-lasting 

- 2 Pre-filters invcluded

The Black Ops 12 inch carbon filter is lightweight with super absorbent charcoal.

Carbon is from Australia a popular choice for filter manufacturers because it's one of the hot most highly porous charcoal on the planet.

This filter you can clean air at a rate of 1700 CFM which is suitable for a more extensive room.

A bonus is you get to pre-filters with the unit And should we be replaced every six months, so you get one year worth of filters.

This can extend the filter length up to 2 years.

iPower 12 Inch Air Carbon Filter

 Top Pick 

Key Features:

- 12 X 24  inches

- 1500 CFM per hour

- Long-lasting 

- 1 Pre-filters invcluded

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 room or tent.

Best carbon filter fan combo

This is a short list of the top filter fan combos out there that won’t break the bank.

Best 4-inch carbon filter fan combo

VIVOSUN 4 Inch Inline Fan with Carbon Filter

Key Features:

- 4X 12  inches

- 203 CFM per hour

- 8 feet ducting 

- 190 CFM Duct Fan

The Vivosun 4 inch combo carbon filter and fan Is the full kit.

With fan, you also get a speed controller which is great if you want to turn down the speed to quiet the fan or when full speed is not required for space.

The carbon filter comes with activated Carbon from Australia Making it highly absorbent.

The great combo when on a budget and could be used for 4 x 4 grow tent. 

Best 6-inch carbon filter fan combo

​Vivosun 6 inch carbon filter with fan

Key Features:

- 6 X 16  inches

- 440 CFM per hour

- Pre-Filter sleeve

- 2450 RPM Duct Fan

The Vivossun 6" combo is good for eliminating odors quickly.

This carbon filter has Australia carbon inside form quality source great for absorbing stinky smells.

The mesh on the filter also has a 53 percent open rate for optimal airflow.

A inline fan that comes with the combo has a dial to decide on the speed you would like. A mounting bracket is included.

This is just a basic setup if you need ducting or clamps you will need to get that as well when buying.

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

Grow on my friends 

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