Q1: What is the function of a High-Efficiency Air Outlet (HEPA Box)? How is it different from an FFU?
A:
High-Efficiency Air Outlet (HEPA Box): A non-powered terminal filtration device. It relies on the fan of the front-end Air Handling Unit (AHU) to provide pressure, forcing air through the built-in HEPA filter into the cleanroom. Mainly used for Class 10,000 and Class 100,000 cleanrooms with centralized air supply systems.
FFU (Fan Filter Unit): Self-powered with its own fan, drawing air from the ceiling plenum, filtering it, and sending it out. Mainly used for distributed air supply systems, especially suitable for Class 100, Class 1,000 high-cleanliness areas or areas requiring flexible adjustments.
Q2: What unique sealing technologies does Deshengxin HEPA Box have? Why is sealing so important?
A: Sealing is the lifeline of a HEPA Box. Any tiny leak will cause unfiltered air to enter the cleanroom directly, rendering the purification system ineffective.
Deshengxin offers two high-end sealing solutions:
Gel Sealing Technology (Recommended): Utilizes jelly-like non-Newtonian fluid (gel sealant). The knife edge of the filter frame inserts into the gel, forming a perfect "airtight liquid seal". Extremely high sealing reliability, and filter installation/removal is extremely convenient, making it the preferred choice for high-requirement cleanrooms.
Dry Sealing (Gasket Compression): Uses high-quality closed-cell EVA or EPDM gaskets, achieving sealing through mechanical compression devices. Mature process, lower cost. Deshengxin has optimized the compression structure to ensure uniform force and prevent leakage.
Q3: Does the HEPA Box come with a regulation valve? How to adjust airflow?
A: Yes, standard configurations include an airflow regulation valve.
Typically, a butterfly valve or opposed multi-blade damper is integrated at the air inlet neck. Through an external adjustment knob or lever, the valve opening can be conveniently adjusted from inside the cleanroom, precisely balancing airflow across various outlets to ensure uniform and stable cleanroom airflow.
Q4: How to choose the material and diffuser plate form for the air outlet?
A:
Housing Material:
Powder-Coated Cold-Rolled Steel: High strength, high cost-performance, suitable for most conventional environments.
SUS304 Stainless Steel: Corrosion-resistant, easy to clean, suitable for pharmaceutical, food, humid, or chemically corrosive environments.
Q5: Does Deshengxin HEPA Box support PAO leak testing?
A: Yes.
For cleanrooms with high standard requirements like Pharmaceutical GMP, on-site HEPA filter integrity testing (DOP/PAO leak testing) is mandatory. Deshengxin can provide HEPA Boxes with dedicated PAO injection ports and sampling ports, allowing aerosol generation and scan leak testing to be conveniently conducted indoors without disassembling the diffuser plate, fully complying with validation spec requirements.
Q6: Can HEPA Box dimensions and air inlet methods be customized?
A: Of course. The advantage of a source factory lies in flexible customization.
Size Customization: Besides standard series sizes like 320/484/610/630, we can customize arbitrary non-standard sizes based on your ceiling modules and airflow requirements.
Air Inlet Method: Offers Top Inlet (occupies more space above ceiling, more uniform airflow) and Side Inlet (saves space above ceiling, suitable for height-restricted locations) options, with interfaces available in round or square flanges.
Q7: How to determine if the filter inside the HEPA Box needs replacement?
A:
Resistance Monitoring (Recommended): Install a differential pressure gauge on the air outlet. When operating resistance reaches 1.5-2 times initial resistance (usually around 400-500Pa), replacement is recommended.
Airflow Detection: Regularly measure outlet airflow. When airflow drops significantly and cannot be restored via regulation valve, it indicates severe filter clogging.
Cleanliness Detection: When cleanroom dust particle counts exceed standards, and other causes are ruled out, terminal filter replacement should be considered.
Q8: Is it troublesome to replace the HEPA filter inside the air outlet?
A: Deshengxin's design fully considers maintenance convenience.
Our HEPA Boxes feature a bottom detachable diffuser plate design. For replacement, simply remove the diffuser plate inside the cleanroom, loosen filter fixing clamps (gel seal type is especially convenient), remove old filter, and install new filter. No need to enter the ceiling plenum, maintenance is simple and fast, minimizing impact on production.
Q9: What corrosion protection measures do Deshengxin's air outlets have?
A:
For cold-rolled steel materials, we adopt strict surface treatment processes: first undergo acid pickling and phosphating to remove oil and rust, increasing adhesion, then electrostatic powder coating, and curing at high temperatures. The resulting coating is sturdy, dense, corrosion-resistant, and anti-aging, adaptable to most industrial clean environments. For higher requirements, SUS304 stainless steel material is directly recommended.
Q10: Why choose Deshengxin's High-Efficiency Air Outlet?
A:
Integrated Manufacturing: Both housing sheet metal and HEPA filters are produced in our own factory, ensuring better matching and clearer quality responsibility.
Professional Sealing Technology: Mature gel sealing process ensures reliable, leak-free performance.
Rich Project Experience: Understand pain points of different industries (e.g., pharma PAO testing, electronics anti-static), providing targeted solutions.
High Cost-Performance: Factory direct supply, eliminating intermediate costs.
Conclusion:
Though small, the High-Efficiency Air Outlet is the "last mile" of the cleanroom. Deshengxin uses precision quality and professional sealing technology to guard this final line of defense for you. For selection support or custom services, contact our engineering team!
