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Absolute Carbon Filters Ltd

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Carbon Filters - The FAQ


What does a carbon filter do?

Carbon  filtering is a method of  filtering fumes and vapours in the air, using activated carbon to remove contaminants and impurities, via chemical adsorption. 

Are there different types of carbon filters?

There are two main types of carbon  filters: powdered block  filters and granular activated  filters. Generally, block  filters are used to remove a larger number of contaminants, based upon the increased surface area of carbon. 

What is activated carbon?

Activated carbon, also called activated charcoal or activated coal, is a form of carbon that has been oxidised to make it extremely porous and thus have a large surface area available for adsorption. In addition to standard activated carbon, Absolute Carbon Filters supply a range of impregnated activated carbons optimised for the adsorption of; acids, ammonia, amines, sulphur compounds, formaldehyde, mercury and other compounds. 

How do activated carbon filters work?


The huge surface area of activated charcoal gives it count- less bonding sites. When chemicals pass next to the carbon particle, they attach to the surface and are trapped. 

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How do I know when my carbon filter needs changing?

There is no perfect method to determine when a carbon  filter is saturated. It depends on usage and concentration of contaminants. Some people rely on smell, but it is advised to follow manufacturers guidelines and change  filters before or at suggested  filter lifetime. 

Do I need a pre- filters?

Pre- filters are recommended for use with carbon and HEPA  filters to avoid larger particles being pulled into the main  filter and restricting filtration which will reduce the filters lifetime. 

Should I use an engineer to replace my carbon filters?

Yes, we always recommend an engineer does this for you. However, Absolute Carbon Filters supply a bag to contain your  filter once it has been removed, if the users or on-site facilities team are familiar with the equipment and confident to remove a carbon  filter then they can do. 

Do you supply all types of filters?

Yes, we can supply a huge range of carbon  filters, whether for a fume cupboard or a specialist piece of equipment. In addition, we can supply your HEPA  filters and replacement parts for a whole host of laboratory equipment. 

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