1. Wind protection netting – prevents the entry of foreign matter and coarse dirt particles
2. Pre-filter – filters particles with a diameter of 3 micrometers and any remaining PRRS viruses adhering to them
3. Main filter – filters fine particles up to a diameter of 0.3 micrometers and any remianing PRRS viruses adhering to them
4. Cooling module – the fresh air can be cooled simultaneously if required
5. Ventilation pipe with fan and cover flap