Providing a comprehensive guide to consider technical factors when selecting an integrated high-efficiency supply air outlet is crucial for users. The correctness of the selection directly affects the performance, operational costs, and long-term reliability of the cleanroom. The following are the core technical factors that users need to consider when making a selection, which can be divided into five dimensions: core performance, structure and materials, control and operation, compliance and certification, and supplier and services.
I. Core Performance Parameters
These are the cornerstone of selection and must be strictly matched with your cleanroom design requirements.
1. Cleanliness Level (Filter Efficiency): Determine the required ISO cleanliness level based on process requirements. Options include:
1.1 HEPA Filters: With a filtration efficiency of ≥99.99% for 0.3μm particles (EN1822 Standard H13) or ≥99.995% (H14). Suitable for most situations up to ISO 5 (Class 100).
1.2 ULPA Filters: With a filtration efficiency of ≥99.9995% for 0.12μm or 0.1μm particles (U15 and above). Suitable for ultra-high standard situations such as ISO 3-5 (Class 1-100).
1.3 Note: Higher efficiency typically results in greater air resistance, which may affect energy consumption and noise.
2. Airflow and Velocity: The face velocity of the integrated high-efficiency supply air outlet directly determines the airflow pattern (e.g., vertical unidirectional flow) and self-cleaning capability of the cleanroom. The conventional requirement is 0.35~0.55 m/s (±20%). Options include:
2.1 Calculate the total airflow required to determine the rated airflow of a single integrated high-efficiency supply air outlet (e.g., 1000 m³/h, 1200 m³/h).
2.2 Focus on airflow uniformity (typically required within ±10% to ±15%), which is key to ensuring uniform airflow and avoiding vortices.
II. Structure and Materials
This relates to the lifespan, sealing, and maintenance methods of the equipment.
1. Box Material
1.1 Cold-rolled steel with plastic spray: The most common choice, cost-effective, good corrosion resistance, and sufficient strength.
1.2 Stainless steel (e.g., SUS304, SUS316): Used in situations with special anti-corrosion requirements, such as biopharmaceuticals, food, or environments exposed to chemical solvents. Higher cost.
2. Filter Installation and Sealing Method
2.1 Removable from below: Strongly recommended, allowing safe and quick filter replacement within the cleanroom without entering the technical mezzanine, using mechanical pressure tightening + gel seal or high-quality rubber gasket sealing, with extremely low leakage risk.
2.2 Liquid seal: Best sealing effect, but slightly more complex to replace, higher cost, commonly used in ultra-high requirement situations, avoid simple bolt pressure + sponge rubber strip sealing, which is less reliable.
3. Air Distribution Device: Ensures uniform airflow velocity. Choose metal perforated plates or damping nets to ensure airflow uniformity meets standards.
III. Supplier and Services
Behind the product is the comprehensive strength of the supplier.
1. Technical Support and Solution Capability: Can the supplier provide professional technical consultation and complete solutions?
2. Case Experience: Does the supplier have successful cases in similar industries (e.g., semiconductors, photovoltaics, biopharmaceuticals)?
3. After-sales and Spare Parts: Is the after-sales service response speed, warranty period, and spare parts supply sufficient and reliable?
Selection Decision Process Suggestion
1. Clarify Requirements: Determine cleanliness level, temperature and humidity, room size, layout diagram.
2. Initial Screening: Based on the above technical factors, screen out 2-3 qualified suppliers.
3. Obtain Solutions and Quotations: Request suppliers to provide detailed technical solutions, configuration lists, and quotations.
4. Comprehensive Evaluation: Don't just look at the unit price. Evaluate performance, energy consumption, control methods, after-sales service, and total cost of ownership (TCO).
5. Reference and Testing: If possible, visit the supplier's successful cases and request performance testing of samples.
By systematically considering the above factors, you will be able to choose the most suitable integrated high-efficiency supply air outlet for your project, thus laying a solid foundation for the long-term stable operation of the cleanroom.