Acrylic Clean Booth / Acrylic Clean Enclosure

• Airflow obstruction: Do not place tall equipment within 30 cm of the air outlet face, as this directly disrupts laminar flow, causing local eddies and particle accumulation.
• Improper entry: Personnel must wear cleanroom garments, hair covers, and shoe covers, and avoid rapid movements or shaking inside the booth – people are the source of about 80% of contamination in a clean booth.
• Operating with faults: If an FFU fan makes abnormal noise or differential pressure is unusual, stop and inspect immediately. Operating with fan issues can cause HEPA filter media damage and backflow of contaminants into the production area.

These three terms define the facility state during testing (per ISO 14644 and GB 50073):

• As‑built: The booth is completed and running, but no production equipment, materials, or personnel are inside. This is the basic state for acceptance.
• At‑rest: Equipment is installed and operating as agreed, but no operators are present. Often used during equipment validation.
• Operational: The booth is in normal production with specified personnel present and following prescribed procedures. This is the most realistic state; cleanliness class may be allowed to be one level lower than at‑rest.

• Pre‑operation: Start the fans 10–15 minutes before personnel entry to allow the system to self‑clean and reach steady‑state cleanliness.
• Filter replacement: Monitor the FFU differential pressure gauge. Replace the primary filter when its resistance reaches twice the initial value, or when HEPA airflow velocity noticeably drops. In normal environments, replace the primary filter at least once a year.
• Cleaning methods: Use tacky rollers or non‑woven wipes with isopropyl alcohol or purified water. Never use cleaners that release silicones or are corrosive, as they may damage anti‑static curtains or filter media.

• Pre‑operation: Start the fans 10–15 minutes before personnel entry to allow the system to self‑clean and reach steady‑state cleanliness.
• Filter replacement: Monitor the FFU differential pressure gauge. Replace the primary filter when its resistance reaches twice the initial value, or when HEPA airflow velocity noticeably drops. In normal environments, replace the primary filter at least once a year.
• Cleaning methods: Use tacky rollers or non‑woven wipes with isopropyl alcohol or purified water. Never use cleaners that release silicones or are corrosive, as they may damage anti‑static curtains or filter media.

Although standard clean booths focus on particle control, temperature and humidity control is also important in precision manufacturing and pharmaceutical operations.
General recommendations: temperature 18 °C–26 °C, relative humidity 45%–65%. Too high humidity promotes microbial growth; too low humidity causes static electricity.
Adjustments can be made by adding cooling/heating coils at the FFU inlets or by using the facility’s existing HVAC system.

• Frame material: Industrial aluminum profile or stainless steel square tubing is recommended. Avoid easily rusting or particle‑generating iron materials. Aluminum alloy is lightweight, aesthetically pleasing, and does not shed particles.
• Enclosure materials: Surrounding walls typically use anti‑static grid curtains or tempered glass. Anti‑static curtains are flexible and dissipate static charges; tempered glass offers better light transmission and durability, suitable for fixed partitions.
• Sealing: Ensure tight seals between FFUs and the frame, and between curtains and the floor, to prevent unfiltered air “short‑circuiting” into the booth and compromising internal cleanliness.

• Laminar flow means air moves at uniform speed along parallel streamlines in a single direction. Clean booths typically use vertical unidirectional laminar flow with uniform velocity (generally 0.45 m/s ±20%). It acts like an "air curtain" that pushes clean air vertically from the top FFUs down to the bottom return, instantly sweeping particles out of the work area and preventing contaminant accumulation.
• Turbulent flow uses induced mixing of supply air with room air, resulting in non‑uniform airflow. It is used mainly for lower cleanliness requirements (e.g., ISO 8 / Class 100K), relying on high air change rates to dilute contaminants.

Different fields have different priorities:

• Electronics manufacturing / semiconductors: Focus on ESD (electrostatic discharge) control. The surface resistivity of the booth frame and anti‑static vinyl curtains should be within 10⁶–10⁹ Ω/□, and proper grounding is required to prevent particle attraction or electrostatic damage to components.
• Biopharmaceutical / food: Focus on viable (floating and settled) microorganism control. Clean booths are often used for material weighing, sampling, or dispensing operations at OEB Class 3 or below, protecting the product from environmental microbial contamination while also protecting operators via negative pressure design or vertical flow.

The cleanliness class of a clean booth is mainly classified according to ISO 14644-1, with common classes ranging from ISO 5 (equivalent to the old Class 100) to ISO 8 (equivalent to the old Class 100K).
ISO 5 requires that the number of particles ≥0.5 μm per cubic meter of air does not exceed 3,520. This class typically uses HEPA filters (with a filtration efficiency of ≥99.97% for 0.3 μm particles) combined with vertical unidirectional (laminar) airflow.
Testing standards generally refer to GB 50073 "Code for Design of Cleanroom Facilities" for acceptance under as‑built, at‑rest, or operational states.

A Clean Room Booth (often called a clean booth, purification booth, or simple cleanroom) is a locally enclosed, high-cleanliness environment device that can be quickly installed and relocated. It primarily uses FFUs (Fan Filter Units) to draw in air, which passes through primary and HEPA filters, and is then delivered as vertical unidirectional flow, creating a positive-pressure clean zone inside the booth.
Compared with traditional constructed cleanrooms, clean booths offer lower investment, faster results, easier installation, high mobility, and reusability. They are well-suited for upgrading local processes with high cleanliness requirements within an existing factory without modifying the entire workshop environment.

Equipped with HEPA/ULPA filters removing particles ≥0.3μm, achieving ISO Class 5 (Class 100) or higher with consistent laminar airflow and stable particle control.

A modular cleanroom system providing high-level clean environment within specific working area. Combines flexibility, cost-efficiency, and easy installation - ideal alternative to traditional cleanrooms requiring local cleanliness.