Activated carbon filters

AFPRO carbon filters are used for the filtration of gaseous particles.The use of either 

loose charcoal or media impregnated with activated carbon enables high efficiency for gases. 

Various types of carbon filter are used, depending on the application, contamination and

concentration in question. The filters can be largely split into three fields of application:

• Organic gases

• Acidic gases

• Alkaline gases

Although various types of carbon filter are used, depending on the field of application, it 

should be noted that the carbon does have to be impregnated to guarantee suitable efficiency 

for both acidic and alkaline gases. Furthermore, the optimum product variant has to be

selected on the basis of the concentration in question. In the case of high concentrations 

of gas, for instance, a cylinder containing loose carbon pellets is used, as it has a higher 

adsorption capacity than a pleated filter element.

Selecting the appropriate carbon filter nevertheless remains a complicated process. However, 

AFPRO sales staff are pleased to assist you in doing so. Furthermore, AFPRO can test 

existing filters to establish their remaining adsorption capacity and service life, then

advise you when they will have to be replaced.

Construction

Our activated carbon filters are available in the form of elements,which can be filled with 

loose activated carbon pellets. These filters are usually refillable and are further 

characterised by their combination of high adsorption capacity and low flow rate. In 

addition, AFPRO has an extensive range of filters which comprise a relatively small amount

of activated carbon sandwiched between two layers of filter media. The flow rate of these 

filters is particularly high, while their adsorption capacity is low. In the case of 

extremely high concentrations of gases, it is also advisable to use stainless steel.

Applications

Activated carbon filters are widely used in airports, record offices,museums and the 

semiconductor industry. The filters can be installed in either standard AFPRO holding frames 

or frames specially designed for the activated carbon cylinders. It is important that 

separate filters are fitted in front of and behind the carbon filters. A pre-filter

is required to prevent the activated carbon filter from becoming clogged with dust 

particles. An after-filter is also required to avoid the possibility of activated carbon 

particles entering the airflow.

Installation

• Ensure that no leakage can occur (new gaskets can be supplied together with filters)

• Ensure that the frame and the cabinet in which the new filter is to be fitted are cleaned  

 first

• Activated carbon pellets may be spilled either during installation or throughout the life  

  span of the filter; ensure that these are removed before the system is turned on

• Maintain records of the filters installed; note the date,type and initial resistance