HVAC system for clean room including: air filter, filter air differ and the fan filter units, clean bench, self-purification, purification unit, prefabricated clean air, air shower, purifying air conditioning units, air handling units, purify air units, etc HVAC system for clean room can realize free combination according to ctomer needs and is widely applied in vario occasions. patented structure, low air leakage, modular design. The unit is applicable to purifying application. Professional selection software, solid structure, no cold bridge or rt. The base frame is equiped with level adjtment device to ensure seamless joint between the sections.