cleanroom HVAC system is a Heating – Ventilation – Air Conditioning system designed to control a cleanroom’s environmental conditions, particularly air cleanliness, temperature, humidity, pressure and airflow. Unlike conventional HVAC, cleanroom HVAC must maintain stable conditions and minimize the entry of dust, microorganisms and contaminant particles into production areas.

How does cleanroom HVAC work?       

Basic process:

Outdoor air → Coarse filter → Fine filter → AHU → HEPA → Cleanroom → Return air → Filtration & recirculation

  • Coarse filters: capture dust and larger particles.
  • Fine filters: remove smaller particles.
  • AHU: condition temperature, humidity and airflow.
  • HEPA: captures very small particles before air enters the cleanroom.
  • Return-air system: returns some air for treatment and recirculation.

What does cleanroom HVAC control?

🌡️ Temperature – maintains suitable production conditions. 💧 Humidity – limits condensation and its impact on products. 💨 Airflow & direction – controls particle dispersion. ↔️ Pressure differential – limits airflow from dirty areas into clean areas. 🧹 Cleanliness – controls airborne particle concentration.

Why is HVAC important to a cleanroom?

HVAC can be regarded as the “heart” of the cleanroom. An unsuitable HVAC design makes it difficult to maintain the required cleanliness, temperature, humidity and pressure. An effective design must coordinate cooling load, airflow, filtration, pressure, ductwork, and supply and return arrangements.