Inline fans are one of the necessities that all growers must buy when starting to grow cannabis indoors, whether you have a large or small grow op. Carbon filters or charcoal filters work in tandem with your inline fans to reduce odor outside of your grow room. In this article we will go over the best carbon filter fans for any sized grow op.
Carbon filters come in different sizes based on the diameter of your inline fan and ducting – From 4″ for small areas to 8″ for more substantial grow rooms. They may all look the same when you shop for filters, but quality differs greatly between brands, so I have picked out the most reliable filters and the best deals.
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1. Best Six Inch Combination Deal: VIVOSUN Inline Duct Fan & Carbon Filter With Australia Virgin Charcoal
Pros:- Fan and filter both included
- High quality and inexpensive
- Convenient to purchase both at the same time
Cons:- Filter pad is not internal
- No warranty
- Ducting not included
Sometimes it is more cost effective to purchase your inline fan and your filter as a combo pack. This fan and filter set is one of the best carbon filter fan combo deals on the market. The six inch inline fan provides a fan speed of 2,450 RPM and the filter is made of 1050 + RC 48 Virgin Australian charcoal. The flange is reversible. The carbon filter has both inner and outer mesh for a 53% open air area, giving better ventilation and air flow. This combo pack also comes with mounting brackets for the fan and an instructional pamphlet.
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2. Best Eight Inch Combination Deal: iPower Inline Fan, Carbon Filter, Ducting & Clamps Combo
Pros:- All equipment included for convenience
- Quiet running fan
- Virgin Australian carbon filter
Cons:- No warranty
- Most expensive option
- May require additional clamps
Last but not least, here is the best carbon filter for grow tent growers that want to get started right away. This is a combination package that includes all of the materials needed to set up a heavy duty ventilation system in your grow room. This package deal includes an eight inch fan, carbon filter, and 25 feet of flexible ducting. The filter is made with 1050 + IAV Australian carbon.
The 745 CFM fan has a lower than average noise level, made with UL components and high quality materials. The aluminum ducting comes with clamps to attach it to the fan and filter, although you may need to purchase additional clamps depending on the configuration of your grow room and ventilation holes.
Find more iPower Inline Fan, Carbon Filter, Ducting & Clamps Combo information and reviews here.
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3. Best Four Inch Filter: VIVOSUN 4 Inch Air Carbon Filter Odor Control with Australia Virgin Charcoal
Pros:- Machine packed Australian virgin carbon filter
- Internal filter is more effective and looks nicer
- Removable flange
Cons:- Aluminium frame is easy to bend
- If bent it will not fit in ducting properly or form an airtight seal
- No warranty
This four inch filter from VIVOSUN has everything you need and no fluff. Vivosun is one of the best carbon filter brands because they also make inline fans. This filter is a simple aluminum framed carbon with an internal carbon pad and a sleek design. The filter flange is removable so that you can replace it without having to buy a new filter. There is mesh on both the inner and outer layers, giving a 53% open are area for better airflow.
The charcoal used is a 1050+ Australian virgin charcoal blend for maximum effectiveness. This filter also has a pre-filter to increase efficiency. This filter is an excellent choice for small grow ops with four inch fans. It also comes in six and eight inch sizes.
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4. Best Six Inch Filter: Think Crucial Carbon Inline Fan Filter & Odor Control
Pros:- Professional design
- CFM rating of 400
- Long lifespan
Cons:- No removable/replaceable parts
- No warranty/li>
- Ducting sold separately
For slightly larger grow ops, you need a larger filter to fit your six inch inline fan and ducting. This filter is designed to last a long time, up to 1.5 years, before needing to be replaced. It has a CFM rating of 400 and is reviewed by customers as durable, reliable and worry-free. This is a professional grade filter that will work great in your home grow op. This is decribed as a worry-free filter because once you install it, you do not need to do any work or mess with it at all in order for it to create an odor free environment in your grow room. It is also great for keeping out allergens and pollen.
Find more Think Crucial Carbon Inline Fan Filter & Odor Control information and reviews here.
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5. Best Eight Inch Filter: TerraBloom Premium Carbon Filter
Pros:- Extra thick carbon bed
- Top grade virgin carbon used
- Sleek design
Cons:- No warranty
- Relatively expensive
- No removable or replaceable parts
If you have an extra large grow room, you need an extra large ventilation system and a very well made and effective carbon filter.
This TerraBloom filter not only looks great, it is well designed and suitable for use in any professional level grow op. This filter uses top grade RC-48 carbon from Western Australia. The carbon bed in this filter is 46mm thick and machine packed. It has very small granules, so that there is at least 15% more carbon in this filter than in the standard 38mm carbon beds you find in cheaper filters. For a professional grow, you need a high quality filter, and this one definitely fits the bill.Find more TerraBloom Premium Carbon Filter information and reviews here.
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6. Best Shell Filter: Yescom 4″ Hydroponic Coconut Shell Air Activated Carbon Filter
Pros:- Unique design
- Inexpensive
- Can be used with any 4" inline fan
Cons:- FIlter may get clogged more quickly
- Cheaper materials than more expensive options
- No fan included
This carbon filter has a unique design using an outer shell made of coconut fiber and a carbon filter inside. The body is 53% open air hoels for greater air flow. It comes in either a 4″ or 6″ size to fit small to medium grow rooms.
Find more Yescom 4" Coconut Shell Air Activated Carbon Filter information and reviews here.
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7. Best High End Kit: VIVOSUN Air Filtration Kit
Pros:- Comesin four or six inch sizes
- Comes fully assembled
- Includes fan, filter and ducting
Cons:- No hanging hardware
- Only two sizes available
- Relatively expensive comapred with cheap options
This is the best high end carbon filter fans out there. It comes complete with everything you need for your ventilation system and is not as expensive as other high end options. VIVOSUN is a trusted brand, and you can purchase this kit in four or six inch sizes.
This kit come with a 2500 RPM inline fan, interior and exterior mesh carbon filter, and sturdy ducting with clamps included. It is ready to go right out of the box with no assembly needed.
Find more VIVOSUN Air Filtration Kit information and reviews here.
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8. VALTCAN Fume Extractor Remover Fan
Pros:- Well made and durable
- Relatively inexpensive
- Three carbon filters included
Cons:- Not designed for cannabis use
- Very small
- Only good for small enclosed spaces, not a whole room
- This tabletop charcoal filter fan is a fantastic option for grow cabinets or small grow tents. In such a small space, a large inline fan filter is overkill and you may not need to spend the money on something so high end. This filter is designed to remove harsh smells like soldering fumes from the air and has three active charcoal filters inside. It is lightweight, durable and adjustable.
Find more VALTCAN Fume Extractor Remover Fan information and reviews here.
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9. Best Standalone Carbon Filter Fan: Hamilton Beach TrueAir 04532GM Room Odor Eliminator
Pros:- Works in a 10' x 10' area
- Standalone and portable
- Two speeds
Cons:- More complex thana simple inline charcoal filter
- Cheap price means it may be less effective
- Not as easy to replace filters as in an inline system
- Instead of purchasing a filter to go in your inline fan ducting, why not use a carbon filter fan that is standalone and can be easily moved? If you are growing in a rental space, grow tent, or other space where you may need to pack up shop at some point, it makes sense to keep your equipment separate and easily portable.
- TwThis carbon filter fan can keep a 10 foot by 10 foot room free of odors for three months before needing to replace the flters. It has two speeds and is extremely energy efficient, using less energy than a 15 watt light bulb.
Find more Hamilton Beach TrueAir 04532GM Room Odor Eliminator information and reviews here.
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10. Best Inexpensive All-In-One Kit: Hydro Crunch 4 inch Hydroponic Ventilation Kit
Pros:- Six or four inch sizes available
- Inexpensive
- Comes with fan, filter and ducting
Cons:- No hanging hardware
- Cheap price may mean cheap materials
- Only two sizes available
Find more Hydro Crunch 4 inch Hydroponic Ventilation Kit information and reviews here.
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11. Best Three Stage Carbon FIlter Fan: Blue Pure 411 Air Purifier
Pros:- Quiet running and energy efficient
- Also filters allergens and pollutants in the air
- Washable pre-filter
Cons:- Relatively expensive
- Not as much air flow as inline filters
- Not great for veyr large rooms
- This carbon filter fan has a three part filtration system meant to catch and trap not only smells but pollutants and allergens as well. This is a good option if you have a medium to large sized groow room that you will be spending a lot of time in, as opposed to a grow tent where you will not be breathing in the same air as your plants but just opening the flap to check on them.
- This filter has an activated carbon filter as well as a washable pre-filter for even greater effectiveness. It runs quietly and is designed for rooms between 100 and 175 square feet. It is energy star rated for best in class energy performance, and the filters are recyclable.
Find more Blue Pure 411 Air Purifier 3 Stage information and reviews here.
Inline fans move the air effectively and efficiently so that the heat in your grow space does not get above what is comfortable for weed plants, about 90 degrees. Increased heat can cause your plants to become dry and wilted, or to absorb more nutrient solution that they regularly would, causing nutrient burn. More heat also means increased relative humidity in most climates, which can create the perfect environment for mold and pests to infest your plants.
Another benefit of good ventilation is the ability to remove odors from your grow op. Most home growers do not like to advertise the fact that they grow cannabis. This is a personal choice and may not always have to do with the legality of marijuana in your state.
Cannabis plants have a very strong and very recognizable smell, and although home growers certainly love the finished product, you might not want to smell it all day every day and your neighbors most likely do not want to either.
Charcoal or carbon filters offer the most effective means of eliminating this odor. The outbound air from your grow room is passed through a thick pad filled with carbon or activated charcoal, which uses chemical absorption to remove odors from the ventilated air. The molecules carrying the cannabis odor are trapped inside of the pores of the carbon molecules. This is one of the most effective odor filtration methods available and has served weed farmers well for years.
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