Clean booths of Class 10–100: To achieve an indoor cleanliness level of Class 100 or higher, the clean airflow within the chamber must be unidirectional and vertical. In other words, at every point across any cross‑section, the airflow direction and velocity remain uniform, enabling the clean air to act like a piston and swiftly carry away particulate contaminants. Achieving vertical airflow requires installing filters across the entire ceiling surface, thereby establishing a unidirectional vertical flow and attaining a cleanliness level of Class 100 or better.

1K–100K clean booths differ from 10–100 clean booths in their airflow patterns: the internal airflow does not move parallel at a uniform velocity and is accompanied by backflows and vortices. Primarily driven by clean air, this airflow continuously dilutes the indoor air and gradually removes contaminants, thereby achieving the desired level of cleanliness. The classification of clean booth levels is mainly achieved by varying the volume of supply air delivered per unit time.

I. Materials of the Clean Booth

Clean booths primarily consist of a housing, fans, high-efficiency air filters, damping layers, lighting fixtures, and an exterior spray system. This product can be either suspended or supported on the floor.

1. Supports: dedicated aluminum profiles, steel square tubing, or stainless steel square tubing.

2. Anti-static curtain: 0.3 mm thick mesh, offering excellent antistatic performance, transparency, clear mesh pattern, softness, and toughness; resistant to deformation and aging; provides effective protection against temperature fluctuations, dust, and static electricity.

3. Excellent antistatic performance, high transparency, and resistance to aging, making it suitable for demanding applications.

4. The purifying blind plate may be made of a 0.3 mm antistatic curtain, a 1.0 mm aluminum sheet, or cold-rolled steel with baked enamel coating.

5. A purified lighting system may be employed.

6. Fan Filter Unit (FFU): A low-noise centrifugal fan with a long service life, quiet operation, maintenance-free design, minimal vibration, and controllable speed. The filter is installed at the outlet of the fan‑blown air supply unit. HEPA filters feature low initial resistance, high dust-holding capacity, excellent filtration efficiency, extended service life, and easy replacement.

II. Clean Booth Purification Level

Most customers’ cleanrooms are built to a Class 10,000 standard; some opt for Class 1,000 or Class 100 clean booths, while a small number choose Class 10. In short, the choice of clean booth class depends on the customer’s cleanliness requirements. However, since clean booths are relatively enclosed, if the cleanliness level is too low, insufficient cooling can often occur, causing occupants to feel uncomfortably hot and stuffy inside.

III. The Relationship Between Cleanrooms and Clean Booths

1. Generally, clean booths are installed within cleanrooms, with the primary function of enhancing the air cleanliness level in a localized area.

2. Clean booths should not be installed inside cleanrooms, as they lack the protection of primary and secondary air filters. Consequently, the service life of the filters within the clean booth is shorter than that of filters used in a cleanroom, leading to higher long-term operating costs.