Sensing some foul smells around your households?

Your grow room can often be the culprit.

The disgusting odor from the grow rooms are a huge concern for growers who live in a lightly congested area or apartment buildings.

Don’t give your noisy neighbors a chance to complain about your grow room.

In this article, we’ll discuss everything you need to know about before choosing an activated carbon air filter.

What is an Activated Carbon Air Filter?

How do they work?

Activated carbon air filters are small pieces of carbon typically in powdered or granular form. They are treated to be extremely porous and so immense that just one gram off activated carbon can have a surface area of  500m2 or even higher.

The vast surface area of activated carbon enables them to absorb exponentially more amount of allergens and contaminants than normal carbon.

Adsorption is the process where organic compounds and other contaminants in air or water react chemically with the activated carbon causing them to stick to the filter.

The filters thus effectively remove hazardous compounds.

What to look for in an Activated Carbon Air Filter?

However, it’s not that easy to choose the right carbon filter considering the abundance of option available in the market.

Considering the factors below you can narrow up your selection process.

1.  Carbon Thickness

The thicker the carbon, the adsorption rate will be greater. The carbon filter will be more effective in removing odors when the carbon in it is thicker. You should expect a higher price for the thicker once since it offers higher efficiency.

2. Pre-filter

Carbon filters often come packaged with pre-filters that are placed outside the carbon filter. This pre-filters prevents particles like dust from entering the carbon filter. This pre-filter can thus improve the life span of the carbon filter and other parts of the appliance.


The compact models are more efficient in absorbing odor and smell and converting them into carbon granules. This model produces less noise and vibration comparing to its competitors. If you love portable gadgets, have a look at our complete guide to buying a rechargeable battery fan


It’s always not a good idea to go for a cheaper one while looking for a carbon filter. A better life span could be expected for an expensive one. The sturdy carbon filters have higher performance and their maintenance is lighter compared to other models.

Top Recommended Activated Carbon Filters

After fare research, we’ve landed on a few handpicked activated carbon air filters from the top sellers in the market. A detailed review and specification are provided to ease up your purchase process.

1. Phresh Filter 701003 Inline Filter, 4 in x 12 in | 200 CFM

Activated carbon air filter PHRESH 701003

The Phresh filter 701003 is the most expensive one of all the products reviewed in this post. Yet it’s proven quality makes it our #1 activated carbon air filter.

Each fresh filter will come with a pre-filter, which is essentially a washable polyester screen that keeps particulate matter from getting into the carbon and clogging it up.

Compared to other competing models, the Phresh Filter is lightweight and has an open air mesh design that maximizes airflow.

Ensuring that the carbon filter has an improved lifespan, handling, and presentation, each filter is sealed, bagged, boxed, and labeled immediately after it’s made.

Although it is more expensive than other models on this list, it comes with extra features that help prevent dust from accumulating in your grow room.

The Phresh filter offers a wide range of size selection so that you can find the one that will suit your application.

While this carbon filter is handy and convenient to use, there are some complaints about the battery covering wobbling when in use.

Product Description

Item Dimension: 7.9 x 8 x 14 inches

Item Weight: 7.35 Pounds


2. iPower 4 Inch Air Carbon Filter

Activated Carbon Air Filter by IPOWER
IPOWER 4 inch Activated Carbon Air Filter

The iPower Carbon Filter uses the Australian RC 412 Activated Carbon that absorbs and traps pollutant molecules efficiently from the air.

This method removes not only odors but also mold, mildew, and other unhealthy contaminants, keeping your grow room super clean.

It also comes with a pre-filter, which can keep your carbon clean.

A vibration table is utilized during the packing to maximize the amount of carbon in the filter while also minimizing movement during shipping.

The flange and the base are also reversible so that you can remove both to reverse the charcoal canister. This allows you to flip the filter body upside-down for better longevity. The top and the base is made of sturdy, lightweight powder-coated aluminum that ensures longevity.

The open-air mesh design also allows for maximum airflow along with cleaning capability. The manufacturer also claims that this product comes with a 53% open area for airflow so you use it either as an intake filter or an exhaust filter.

In addition, it features two poly-cotton pre-filters are included for initial large contaminant removal before air hits your carbon.

Product Description

Item Dimension: 8 x 8 x 13 inches

Item Weight: 6 Pounds


3. Amagabeli 4 inch Activated Carbon Air Filter

Activated Carbon Air Filter by AMAGABELI

It is one of the best-rated carbon filters on the market.

It has an efficient capability to clean you grow room of foul odors, foreign particles, dust, and other organic compounds, thanks to the machine packed Australian Virgin Charcoal used for its manufacturing.

The Amagabeli 4 inch Carbon Filter has washable pre-filters and elastic bands that can easily be mounted around carbon filter.

The inner and outer mesh is made of Aluminum which increases the airflow, thus making it the perfect equipment to use.

The Carbon Filter comes with a charcoal design that ensures appropriate absorption of air molecules to ensure lifelong usage.

Customers are pleased with the filter’s quality and lifetime comparing with its competitors.

Since the unit is heavy duty some users found it a bit heavier.

It makes growing basil, sage, thyme, and other herbs indoor easier and can help you keep your entire operation simple without troubling others.

Product Description

Item Dimension: 13.4 x 7 x 4 inches

Item Weight: 8.6 Pounds

4.  VIVOSUN 4 Inch Activated Carbon Air Filter for Odor Control

Activated Carbon Air Filter by VIVOSUN

The pre-filter wrapped around the VIVOSUN 4 Inch Activated Carbon Air Filter ensures that clean air is produced from the unit.

This helps to prolong the usable life of the carbon charcoal inside the unit. It can handle up to 500 CFM and many users have successfully used it with 4” inline fan.

And while this is the 4” version, variants of 6” and 8” are also available if you want a larger size.  The galvanized steel and high-quality charcoal built make it useful as an intake filter or exhaust filter. It comes with good instruction on how to install it in different ways.

It features a reversible base and flange as well as the filter belts to support the carbon inside your grow tent.

While it’s an affordable option among the carbon filters in this list, we have determined that it has an excellent quality based on the overall performance and reviews from its users.

Product Description

Item Dimension: 15 x 7.8 x 7.8 inches

Item Weight: 7.7 Pounds