This presentation demonstrates why professional HVAC maintenance according to VDMA 24186 is crucial for stable cleanroom conditions – because if the air stagnates, the cleanroom stagnates. The presentation covers the relevant maintenance steps for supply, exhaust, and recirculation systems, the condition of critical components such as filters, fans, and humidifiers, as well as typical weak points that can compromise the cleanroom. Furthermore, it explains how regular, standards-compliant maintenance ensures system performance, prevents failures, and guarantees consistent cleanroom quality.