In 1999 the cupola of the joint-stock company SLEVARNA LIBEREC, Ltd. was deducted with industrial cloth filters. The firm APF used for deducting the FVU filter type. The realization of the whole solution is divided to regulation, cooling, and filtration. The output measured values of concentrations show that if the question is solid contaminating matters then the FVU filter is able to ensure output concentrations lower in order than are determined by the law.