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.

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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