The filter material used is selected according to the gases to be filtered.  To determine what gases are present and their amounts, a gas analysis can be performed for the outdoor air. For more information on this analysis, please see the ‘Solutions and services’ section.

For more information on Halton’s chemical filter materials, see the PDF product sheets below, which contain details on, among other things, their uses, materials, and technical properties. To view the product sheets, you need the Adobe Reader software, which can be downloaded from the Adobe Web site.