
Charcoal filters are a popular choice for air purifiers due to their effectiveness in removing impurities from the air.
Activated charcoal filters can remove up to 99% of airborne pollutants, including dust, pollen, and other allergens.
Charcoal filters are also effective at removing odors and gases from the air, making them a great choice for people with pets or allergies.
The lifespan of a charcoal filter varies depending on usage and quality, but on average, it can last anywhere from 6 to 12 months.
What Are Charcoal Filters?
Charcoal filters are a type of air purification solution that's great for odor and VOCs removal.
A charcoal filter gets its name from the carbon leftover from a burned material, such as wood.
Activated charcoal, also known as activated carbon, has an additional industrial process that makes it even more effective at trapping gases.
This process involves injecting hot air, carbon dioxide, or steam into the carbon substance to create a porous structure, which increases its surface area exponentially.
A single gram of activated carbon can have a surface area that meets 32,000 square feet, making it incredibly effective at trapping molecules.
Carbon filters work through adsorption, where molecules stick to the surface of the carbon matrix.
On a similar theme: Are Carbon Air Filters Worth It
What Is a Filter?
A filter is essentially a device that helps remove impurities from the air. It's a crucial component in air purification systems.
Carbon filters, in particular, are very popular for odor and VOCs removal. They work by using activated carbon or charcoal to trap gases.
Activated carbon is made from carbon leftover from a burned material, such as wood. This process creates a porous structure that allows for an incredibly large surface area.
A single gram of activated carbon has a surface area equivalent to 32,000 square feet. This is what makes activated carbon so effective at trapping molecules.
Carbon filters work through adsorption, where molecules stick to the surface of the carbon matrix. This process is what makes them so good at removing impurities from the air.
For more insights, see: Why Do My Air Filters Get Dirty so Fast
What Are Different Types
There are many types of charcoal filters available, but one popular option is the pleated carbon filter, which has activated carbon bonded to a MERV-8 pre-filter medium.
Expand your knowledge: What Do Carbon Filters Remove from Air
This type of filter is great for when you want to reduce particulate and germ levels, and can be used in conjunction with a HEPA filter for maximum cleaning power.
A pleated carbon filter can also provide some odor and VOC relief, making it a good choice for homes with pets or smokers.
Another option is the V-Bank activated carbon filter, which is designed to efficiently remove gaseous pollutants at high airflows.
V-Bank filters provide a long-life option that offers optimal odor, fume, and VOC elimination, making them a great choice for homes with strong odors or pollutants.
Expand your knowledge: Carbon Filters Air
Filtration Effectiveness
Activated charcoal filters are incredibly effective at filtration due to their ability to remove many gas or chemical contaminants. They can adsorb smoke particles, vapors, and most gases in your indoor air.
One key reason for their effectiveness is their extremely large capacity to remove contaminants by volume. With an extremely high surface space per volume, activated charcoal can grab onto particles that might otherwise pass through other filtering substances.
Activated charcoal also works consistently well under various conditions, such as changes in temperature, humidity, and atmospheric changes. This means it remains effective in different environments, including homes, offices, or commercial settings.
Here are some common gases that activated carbon filters can reduce:
- Acetone
- Paint fumes
- Gasoline
- SOx
- NOx
- Volatile Organic Compounds (VOCs)
- Ozone
- Formaldehyde
- Benzene
- Toluene
- Xylene
What Are They Used For?

Activated carbon is a powerful tool for purification, and its uses go far beyond just air purification. It's a game-changer for removing impurities from drinking water, making it a popular choice for households.
Activated carbon filters can be used to remove particles and unpleasant tastes from drinking water, making it a must-have for many households. I've seen it work wonders in my own home, and I'm sure you'll be impressed by its effectiveness.
From aquariums to hospitals, activated carbon is used in a variety of applications where purification is required. It's even used in the decaffeination of coffee and the purification of gold, showing just how versatile it is.
Here are some surprising uses for activated carbon:
- Decaffeination of coffee
- Purification of gold
- Treatment for some kinds of poisoning
Activated carbon's ability to adsorb odors and chemicals makes it a valuable asset in many industries. Its large surface area allows it to bind a large amount of impurities, making it long-lasting and efficient.
Charcoal's Filtration Effectiveness

Activated charcoal is an extremely effective filtration material, capable of removing many gas or chemical contaminants from the air. Its large surface area allows it to grab onto particles that might otherwise pass through other filtering substances.
Activated charcoal filters have an extremely high surface space per volume, which enables them to remove a large amount of contaminants by volume. This high surface space is a result of the activation process, which involves heating the charcoal to incredibly high temperatures, causing it to become extremely porous.
The activation process creates an internal surface area the size of a football field in each pellet of charcoal. This large surface area allows the charcoal to adsorb odors and chemicals, binding them to the carbon and removing them from the air.
Activated charcoal filters can capture both small and large particles, but do best at capturing larger particles. The size of the pores in the carbon determines the size of the particle that it can trap, with the smaller the pore, the smaller the particle that it can trap.
For another approach, see: High Performance Air Filters
Here are some key benefits of using activated charcoal filters:
- Removes many gas or chemical contaminants from the air
- Has an extremely high surface space per volume
- Creates an internal surface area the size of a football field in each pellet of charcoal
- Can capture both small and large particles
- Does best at capturing larger particles
A carbon filter can reduce fumes and odors, such as diesel, tobacco and wildfire smoke, pet odors, odors from cooking activities, auto exhaust, off-gassing, and more. This can be all the more important in a commercial setting, where fumes can be detrimental to occupant health.
Activated carbon filters can also reduce gasses including those produced from acetone, paint fumes, gasoline, SOx, NOx, Volatile Organic Compounds (VOCs), and even ozone. Common VOCs that carbon filters can capture include formaldehyde, benzene, toluene, and xylene.
Product Reviews
Charcoal filters for air purifiers are a popular choice for many reasons. They're effective at removing gases, odors, and volatile organic compounds (VOCs) from the air.
Activated charcoal is the key component of these filters, which can capture up to 99% of pollutants as small as 0.3 microns. This is because the charcoal's porous structure allows it to attract and trap pollutants.
The lifespan of charcoal filters varies depending on usage and quality, but on average, they need to be replaced every 6-12 months. This ensures the filter continues to work effectively and doesn't become a breeding ground for bacteria.
Alen BreathSmart 75i

The Alen BreathSmart 75i is a powerhouse of an air purifier, capable of handling rooms up to 448 square feet. It's the largest and most powerful model in Alen's BreatheSmart line.
This air purifier comes with a HEPA H13 filter and 3.6 pounds of activated carbon, making it a top choice for removing VOCs, secondhand smoke, and other pollutants. The filter technology is impressive, with ionizer technology adding an extra layer of cleaning power.
The Alen BreathSmart 75i has a high-quality laser particle sensor onboard, which helps track air quality in real-time. It also comes with an air quality indicator in the form of an LED ring in the control panel and smartphone connectivity through the Alen app.
Here are the key specs of the Alen BreathSmart 75i:
The Alen BreathSmart 75i is a significant investment, but it's backed by a lifetime warranty with product registration and an active filter subscription. It's also made in China, but manufactured in the United States.
Austin HealthMate

The Austin HealthMate is a powerhouse of an air purifier, especially when it comes to dealing with VOCs. It contains a whopping 15 pounds of activated carbon, making it the most powerful air purifier you can get for this purpose.
You'll notice the benefits of having this purifier in your home, but it's worth noting that its particle removal capabilities are limited to five air changes in spaces up to 234 sq. ft. with a PM1 CADR of 156 cfm.
The filter in the HealthMate is larger than most small air purifier models, making it a standout in its class.
Iq Health Pro Plus
The IQAir HealthPro Plus is a powerful air purifier that's designed to tackle VOCs and other airborne pollutants. It features a HyperHEPA filter and a V50-CELL with 5lbs of activated carbon and zeolite mix.
The CADR (Clean Air Delivery Rate) of the IQAir HealthPro Plus is impressive, with a top speed PM1 CADR of 213 cfm, which will provide five air changes per hour in rooms up to 319 sq. ft. This is a significant increase in coverage area compared to other models.

One thing to note is that the IQAir HealthPro Plus is a large device, measuring 28H x 18W x 16D inches (71H x 38W x 41D cm) and weighing 35 lbs (15.88 kg). This size may be a consideration for those with limited space or mobility.
The noise level of the IQAir HealthPro Plus is relatively low, even on the highest speed setting, with a maximum noise level of 61.2 dB from 3 ft. away. This is a welcome feature for those who plan to use the air purifier in a bedroom or living room.
Here are the key specifications of the IQAir HealthPro Plus at a glance:
The IQAir HealthPro Plus also has a relatively low electricity consumption, with a maximum power consumption of 145.2 watts on the highest speed setting. This is a welcome feature for those who are concerned about energy efficiency.
The filter lifespan of the IQAir HealthPro Plus is 4 years, which is a significant advantage over other models. Additionally, the manufacturer offers a 10-year warranty, which provides peace of mind for the buyer.
Understanding the Process

Activated carbon filters work by trapping pollutants in the pores of their surface, rather than dissolving and permeating them into another substance. This process is called adsorption, not absorption.
The porous structure of activated carbon is key to its filtration power. By opening up its pores, also known as activating it, chemists create more sites for pollutants to bond with and get trapped.
A pound of activated carbon has a staggering surface area of four million square feet if flattened, which is roughly 70 football fields. This means it has plenty of space to capture and hold onto pollutants, making it an effective filter for air purifiers.
Work
Activated carbon's porous structure is what makes it so effective at filtering out pollutants. This structure allows it to capture pollutants in its pores, rather than dissolving them like absorption does.
A pound of activated carbon can have a surface area of four million square feet if flattened, which is equivalent to nearly 70 football fields. This is because the pores of the carbon are opened up to create more sites for pollutants to bond with.
Activated carbon has been used for a variety of purposes, including as a key ingredient in gas masks during World War I. Today, we use it for everything from filtering air and water to cleaning up oil spills.
ISO

ISO-Aire offers a range of air purifiers that incorporate innovative technologies to improve indoor air quality.
Their HEPA air purifiers come equipped with a MERV-8 pleated activated carbon filter, which is a great option for those looking for HEPA filtration and odor reduction.
This filter is available in all ISO-Aire HEPA air purifier models, providing a comprehensive solution for households and businesses.
ISO-Aire's carbon series air purifiers use an activated V-bank carbon filter, which is more effective at eliminating odors and VOCs than the HEPA filter.
These carbon models also include ozone-free bipolar ionization, which maximizes odor and VOCs reduction without producing any ozone.
Their carbon series air purifiers come with a MERV-9 pre-filter, which extends the life of the carbon filter and provides additional particle and germ reduction.
All of ISO-Aire's carbon models are designed to be ozone-free and are guaranteed to produce no ozone.
Here's an interesting read: What Does Merv Stand for in Air Filters
Maintenance and Replacement
Activated carbon filters do require upkeep.
Activated carbon filters can become overloaded, allowing chemicals to pass through and potentially off-gas some of what they've captured.
It's essential to replace filters once they're spent to ensure they continue to work effectively.
Activated carbon filters typically need to be replaced to prevent the pores from becoming overloaded and allowing chemicals to pass through.
Frequently Asked Questions
Is a charcoal filter better than a hepa filter?
Charcoal filters excel at odor removal, while HEPA filters are more effective at capturing larger allergens like dust, bacteria, and pet dander
Featured Images: pexels.com

