The clean room crane in the pharmaceutical workshop, the clean room in the 10,000-level area contains a local 100-level area. This situation is also more common in the clean area of ​​the pharmaceutical production plant. In this case, the area of ​​the local 100-level area is generally within 10m2. It can be used The air supply of the 10,000-level purification air-conditioning system controls the indoor temperature and humidity, and supplements the fresh air. Increase the circulating air volume in the local 100-level area. The circulating air treatment method can adopt the above-mentioned method 1, that is, a static pressure box is used in the ceiling of the local 100-level area. The level area is full of FFU, and FFU is used to treat the circulating air. The circulating air treatment method can also adopt the above-mentioned method 2, that is, the static pressure box is used in the ceiling of the local 100-level area, and the high-efficiency filter is covered in the 100-level area. Circulating fans are pressurized, and dust-free driving applications are common.