When an optics and electronics assembly workshop goes through a factory audit, what matters is not the Class 10,000 plaque on the wall, but whether the core stations have local high-grade protection and whether temperature and humidity, chemical contaminants, and particles can be measured and recorded. A nominal Class 10,000 cleanroom with no laminar flow and no stable constant temperature in the core area is a common way to pay tuition. Usually it is not necessary to make the entire plant ISO 5 (Class 100): provide local ISO 5 (Class 100) unidirectional-flow protection at core precision stations, maintain the background at ISO 6 (Class 1,000) or ISO 7 (Class 10,000), and separate them with a pressure differential gradient. Pressure differential, air changes per hour, and unidirectional-flow cross-section velocity shall be selected in accordance with GB 50073-2013; when temperature and humidity control are required simultaneously, reference may be made to the published ±1℃ / ±5%RH of the NUNXIN (暖心自控) 5RT variable-frequency heat-pipe dehumidification heat pump, and calculations shall be performed according to the load. Particles landing on photosensitive surfaces, seasonal temperature drift causing alignment offset, and workshop VOCs or siloxanes causing fogging of optical windows—these problems are often first mistaken for equipment and process failures.
Such problems are often not "failure to carry out cleanroom decoration," but rather that the decoration amounts only to enclosure and suspended ceiling: the core area has no laminar flow, the alignment process has no stable constant temperature and humidity, the air-conditioning system has no chemical filtration section, and monitoring is not online. The money was spent on the walls, but the parameters did not hold.
From the perspective of NUNXIN (暖心自控) work in clean air conditioning, constant temperature and humidity, and monitoring control, this article explains several common types of environmen