9 Best Carbon Filters for Grow Rooms and Grow Tents

A carbon filter is an air or water purification system that utilizes activated carbon to remove impurities and contaminants. It works by adsorbing the pollutants onto the surface of the carbon, trapping them, and preventing them from circulating further.

Using a carbon filter in grow tents offers several benefits. The primary advantage is the removal of odors emitted by plants, which can be a concern for indoor growers.

When choosing a carbon filter, it is important to prioritize the quality of the carbon used. High-quality activated carbon with a larger surface area provides better adsorption capabilities.

Additionally, consider the flow rate and capacity of the filter to ensure it can effectively handle the volume of air or water you need to purify.

1. VIVOSUN 4 Inch Air Carbon Filter – Best pick

The VIVOSUN 4 Inch Air Carbon Filter has excellent odor control with premium RC 412 Australian Virgin charcoal at 1200+ IAV to eliminate smells and chemicals.

The 38mm thick charcoal bed with high microporosity ensures high absorption. The Vivosuns’ unique design features dual-sided galvanized steel mesh with a round-hole design for maximum airflow at 223 CFM. The lengthened carbon canister enables a higher filtration rate.

The Vivosun filter is versatile for use in grow tents, hydroponics rooms, kitchens, or basements. The detachable pre-filter cloth blocks 99% of the particles for a clean filter. The reversible flange and base made of heavy-duty iron can be exchanged for exhaustive smell filtration and prolong the filter’s service life.

It is compatible with a 4-inch inline duct fan for intake and exhaust ventilation systems. It includes a pair of belts for convenient assembly in a grow tent. 

We rated the Vivosun carbon filter at 4.5/5. 

Pros: Suitable for versatile applications

Cons: Does not remove organic vapor odors.

2. AC Infinity Air Carbon Filter – Runner-up

The AC Infinity Air Carbon Filter is an 8″ inline filter that blocks odors and chemicals in grow tents and hydroponics rooms.

The AC Infinity filter features premium-grade Australian charcoal for greater adsorption and a longer life rating of 24 months compared to HYDROWE Air Carbon Filter, which is estimated to last up to a year. The powder-coated gunmetal finish ensures high durability and rust resistance in a humid environment.

The carbon filter maximizes airflow and minimizes CFM loss by using galvanized steel mesh lining the inner chamber and outer body. It also includes two washable sleeves that prevent carbon residue buildup, ensuring a clean and efficient air filter.

The duct opening is 8″, the length is 20″, and the thickness is 38mm.

We rated this carbon filter at 5/5 stars.

Pros: High durability. 

Cons: Price.

3. Vanleno 4 inch Carbon Filter – Best long-lasting carbon filter

The Vanleno 4 inch Carbon Filter features high-quality Australian Virgin Activated Carbon with an IAV (Iodine Adsorption Value) of 1200+ for efficient odor removal. 

The Vanleno is lightweight and designed for enclosed environments such as grow tents. The filter has 1.6 mm aluminum tops and bases, reducing its weight compared to other filters. It offers more airflow with a larger open custom mesh, maximizing the filter’s lifespan. The inner and outer mesh has a 53% open area, allowing for increased air flow and long-lasting performance. Two washable pre-filters are included, and replacement carbon sleeves are available to extend their lifespan even further, estimated at 12 months.

We rated the Vanleno filter at 4.5/5. 

Pros: Extended lifespan due to high-quality construction. 

Cons: Users report issues with odor extraction. 

4. TerraBloom 6″ x 24″ Carbon Filter – Dual direction filtration

The TerraBloom Carbon Filter offers unmatched air filtration with a 46mm activated charcoal air filter. The filter enhances airflow up to 550 CFM and effectively combats odors and pollutants. 

Made with premium Australian activated charcoal, it is perfect for various applications such as grow tents, laser engraving, food processing, and manufacturing.

 The installation allows for both inside and outside placement, accommodating exhaust and intake air. The TerraBloom filter is ideal for large spaces like 5×5 ft, 6×6 ft, and 8×8 ft grow tents or similar-sized commercial cultivation facilities. 

The carbon filter package includes two machine-washable pre-filters and a pre-installed aluminum flange for added convenience. A 46mm carbon charcoal filter bed ensures superior odor elimination and top-notch air quality.

We rated the TerraBloom Carbon Filter at 5/5.

Pros: Dual-direction filtration for exhaust and intake

Cons: /

5. HYDROWE Air Carbon Filter – Best for hydroponic growth chambers

The HYDROWE Air Carbon Filter is highly effective for ventilating your smaller grow tent, such as 2x2x3 or even 2x4x5.9.

The Hydrowe filter features high-quality carbon specially imported from Australia, providing a stronger adsorption capacity. This filter efficiently removes odors associated with indoor growing plants and offers deodorization capabilities. This is all thanks to the filter design, which incorporates a 53% open area.

Its unique design, including steel flanges, galvanized steel mesh, and a clothed pre-filter, ensures durability. The cone-shaped internal base further enhances its performance. 

The HYDROWE Air Carbon Filter is suitable for various applications, including indoor planting tents and hydroponic growth chambers.

The average life expectancy of the Hydrowe filter is 24 months. The manufacturer recommends changing the filter every three months for better use.

We rated the HYDROWE filter at 4.5/5 stars. 

Pros: High-quality carbon.

Cons: /

6. Spider Farmer 6 Inch Carbon Filter – Best for versatile use

The Spider Farmer 6 Inch Carbon Filter is a high-quality option for air filtration. The filter uses top-grade Australian activated charcoal for better adsorption and carbon porosity.

Thanks to the four-stage design that features pre-filter, outer mesh, charcoal bed, and inner mesh, the Spider Farmer effectively eliminates odors and particulates in indoor grow tents and hydroponics rooms. The filter has a long lifespan of up to 24 months and features heavy-duty aluminum flanges and galvanized steel construction for durability.

The Spider Farmer filter also includes a washable pre-filter for enhanced adsorption. The 6’’ Spider Farmer carbon filter is suitable for use in grow tents and locations such as kitchens or bathrooms.

Many users have compared the Spider Farmer carbon filter with the AC Infinity, mentioning that SF works just as well as the AC Infinity at a lower price point. However, some users have said that Spider Farmer is a bit too strong for smaller grow rooms of 4×4, so you must consider your room size before purchasing. 

We rated the Spider Farner at 4.5/5. 

Pros: Suitable for versatile use. 

Cons: A few users are unsatisfied with odor extraction.

7. MARS HYDRO 4 Inch Carbon Filter – Best efficient odor control

The MARS HYDRO 4 Inch Carbon Filter is a good choice for efficient odor control as it uses imported 1050+ Virgin Australian activated charcoal, ensuring 100% filtered airflow. This makes it perfect for purifying the air in grow tents/rooms, eliminating odors from pets and smoke. 

The filter can be used with a 4-inch inline fan for both intake and exhaust configurations, making it versatile. Its heavy-duty construction includes aluminum flanges and dual-sided galvanized steel mesh.

The package also includes a machine-washable pre-filter cloth to prevent carbon residue. With dimensions of 4″ Flange Ducting x 12″ Length and an airflow rating of 210 CFM, the MARS HYDRO 4 Inch Carbon Filter is a reliable choice for odor control in various settings.

The MARS HYDRO filter has a replaceable carbon element like most carbon filters. Changing the carbon element every 1-3 months is recommended to ensure proper airflow and odor extraction. 

The low noise level of only 26 dB makes this carbon filter unique. Mars Hydro is a quieter option compared to the 40 dB by Vivosun.

We rated the MARS HYDRO 4 Inch Carbon Filter at 5/5. 

Pros: Provides 100% filtered airflow

Cons: Limited to a 4” duct size. 

8. MELONFARM 4-Inch Air Carbon Filter – Best easy installation

The MELONFARM 4-Inch Air Carbon Filter is reliable for effective odor control and air purification. It has a 4″ duct opening and a length of 12″, with an airflow rating of 280 CFM. Made with premium Australian charcoal at 1200+ IAV, this filter offers superior odor elimination and a longer lifespan. 

Compared to the Mars Hydro filter, the MELONFARM filter emphasizes its previously mentioned premium carbon bed. The quality of the activated carbon used can impact performance, and MELONFARM’s choice is highlighted as a strong selling point.

It can be used in various indoor settings, such as grow tents and hydroponics rooms, to eliminate odors and gaseous compounds. 

The filter is compatible with a 4-inch inline duct fan, allowing for flexible intake and exhaust configurations. It includes a detachable pre-filter cloth that blocks 99% of particles, keeping the filter clean. The package also comes with a pair of hangers for easy installation. 

Overall, the MELONFARM 4-Inch Air Carbon Filter is a high-quality choice for improved air quality in grow tents. We rated it at 4/5.

Pros: A detachable pre-filter cloth is included to keep the filter clean.

Cons: 280 CFM may not be sufficient for a larger grow tent.

9. iPower 6 Inch Air Carbon Filter – Best 6″ carbon filter

The iPower 6 Inch Air Carbon Filter is a powerful odor scrubber with an airflow of 430 CFM.

The activated carbon used provides excellent absorption and long-lasting performance. It can be used as both an intake and exhaust filter in various setups, including inline fans, duct fans, and ventilation ducts.

Compared to the Vivosun carbon filter, the iPower filter is larger at 6 inches, making it suitable for medium to larger grow tents and rooms such as 5x5x6.5 feet.

The iPower filter is reliable for absorbing pungent smells in indoor grow tents. The package includes the 6-inch x 16-inch air carbon filter and one free pre-filter. 

It is recommended to replace the pre-filter every 6 months for optimal protection. The reversible flange on the iPower filter ensures flexible installation and compatibility with various ducting systems. This adaptability differentiates it from filters with fixed flanges, such as the Hydrowe filter. 

We rated the iPower filter at 5/5. 

Pros: High-quality construction and durability.

Cons: Not suitable for a large grow room.

How Do You Choose the Best Carbon Filters for Indoor Growing?

When choosing the best carbon filters for indoor growing, it’s important to consider the quality of the carbon, thickness of the carbon bed, lifespan of the filter, price, and warranty.

Quality of the carbon: The quality of the carbon used in the filter is crucial because it determines its ability to remove odors and impurities from the air effectively. High-quality carbon has a larger surface area, allowing it to adsorb more contaminants. Look for filters that use activated carbon, as it is known for its exceptional adsorption properties.

Thickness of the carbon bed: Thicker carbon beds provide a larger surface area for adsorption, resulting in better filtration efficiency. Carbon beds should be around 1.5 to 2 inches thick to ensure optimal performance. A carbon filter with a thickness of 1.5 to 2 inches can effectively handle an indoor growing space of up to 4’x4′ or 5’x5′. This size range is commonly used for small to medium-sized indoor gardens or grow tents.

The filter’s lifespan: A longer lifespan means you won’t have to replace the filter as often, saving you time and money. Look for filters with a durable construction and a lifespan of at least 12 months.

Price: While opting for the cheapest option is tempting, remember that quality and performance should not be compromised. Investing in a slightly more expensive filter with better features can save you money in the long run. The average price for a high-quality carbon filter is around $50.

Warranty: A warranty shows the manufacturer’s confidence in their product and provides peace of mind for the buyer. Look for filters with a warranty of at least one year, which indicates the manufacturer’s commitment to customer satisfaction.

What is the Best Carbon Filter for Grow Rooms?

The best carbon filter for grow rooms is the VIVOSUN 4 Inch Air Carbon Filter. This is an excellent choice for maintaining air quality in small to medium-sized grow rooms. This carbon filter features a 4-inch flange, making it compatible with most ventilation systems. It utilizes high-quality Australian activated charcoal to effectively remove odors and purify the air.

What is the Best Carbon Filter Kit for a Grow Tent?

The best carbon filter kit for a grow tent is the TerraBloom Carbon Filters. These filters have consistently received positive feedback for their effectiveness in eliminating odors and ensuring clean air in grow rooms. The high-quality construction and long-lasting performance make them a reliable choice for growers.

What is the Best Carbon Filter for 4×4 Grow Tents?

The best carbon filter for 4×4 grow tents is the TerraBloom filter. The TerraBloom Carbon Filter offers superior air filtration and versatile installation options. Its 6″ x 24″ size fits perfectly in the limited space of a 4×4 grow tent while enhancing airflow up to 550 CFM. The high-grade Australian activated charcoal effectively absorbs odors and pollutants, ensuring a fresh and clean environment.