NEVAYS designs and installs HVAC for cleanrooms and controlled environments in line with ISO 14644, EU GMP and FDA. HEPA H14 and ULPA U15 filtration, energy recovery, BMS integration, positive/negative pressure management. Controls: temperature 18–25°C ±0.5°C, humidity 30–70% RH ±5, pressure 5–50 Pa, air changes 15–600 ACH. Applications: EU GMP Grade A–D, semiconductor ISO Class 1–5, BSL 1–3, DIN 1946-4 operating rooms, food processing and EN 14175 laboratories.