Dust and ammonia are the substances to be cleaned from the waste air. Prescribed are cleaning efficiencies from 70-90% depending on where the sheds/stables are located. To efficiently and economically comply with this task, filling materials are needed which can be used in both counter and cross-flow applications (e.g. tunnel ventilation) in local waste air cleaning systems. The filling materials we have developed comply with all the requirements and have proved their operating efficiency in hundreds of installations.